Firefighter Background Check, Polygraph & Psych Eval

A firefighter background check verifies your driving record, employment history, drug use, criminal history, and references, and many career departments pair it with an in-person polygraph and a psychologist interview. As of September 2026, the Denver Civil Service Commission gives candidates 5 business days to submit their Background History Questionnaire (BHQ), while the Calgary Fire Department uses a 104-question Personal History Statement (PHS) confirmed by a polygraph exam. Every disclosure you make on your written forms and during your oral board is cross-checked against these truth-verification steps.

Last checked Nov 4, 2026.

How the Vetting Stages Fit Together

In career municipal fire departments, background screening runs in a connected sequence from your first questionnaire through your post-offer medical and drug tests. The Denver Civil Service Commission structures entry-level and lateral firefighter vetting around an electronic Background History Questionnaire (BHQ), an in-person polygraph examination, a non-medical Job Suitability Assessment (JSA) with a licensed psychologist, a 5-person Fire Department Panel Interview, a formal background investigation, and a Commission Deliberative Review before a conditional job offer. After accepting a conditional offer in Denver, you complete a physical medical evaluation, a medical Psychological Job Suitability Assessment (PJSA), fingerprinting, and a hair follicle drug screen.

On the Houston Fire Department Applicant Roadmap, candidates schedule fingerprints within 7 calendar days of the Civil Service Exam, complete an Applicant Questionnaire, complete a telephone interview with a recruiter to prepare for and schedule the polygraph examination, and then complete a psychological evaluation and background check before receiving a conditional job offer. Under Houston's 2025 to 2029 Collective Bargaining Agreement alternative hiring process for certified individuals, applicants must pass a polygraph or psychological exam, Physical Ability Test (PAT), background check, physical exam, immunizations, and drug test.

In Canada, as of November 2026, the Calgary Fire Department requires applicants to upload a 104-question Personal History Statement (PHS) at Step 4, complete an in-person Behavioral Descriptive Interview at Step 5, and complete an in-person Pre-Employment Polygraph (PEP) at Step 6 before moving to reference checks at Step 8 and the Selection Committee at Step 9. If you want to practice speaking clearly about your history before your panel, you can Start a firefighter mock board with Ten-Four.

Because these stages feed into one file, candor on your oral board directly connects to your background check. Calgary's PHS instructions state that the purpose of the polygraph is to verify your truthfulness and confirm that you are the person you claim to be in your employment application forms, questionnaires, documents, and interviews. When you prepare through our 4-week firefighter interview preparation plan, align the examples and timelines you use out loud with the exact dates on your written background packet.

Stage	Denver Fire Department	Houston Fire Department	Calgary Fire Department
Background Questionnaire	Electronic BHQ, due within 5 business days	Applicant Questionnaire	Personal History Statement (PHS, 104 questions) at Step 4
Oral Interview / Pre-Polygraph Call	5-person Fire Department Panel Interview	Telephone interview with recruiter to prep for and schedule polygraph	In-person Behavioral Descriptive Interview (STAR format) at Step 5
Polygraph Exam	In-person polygraph in Denver with approved vendor	Polygraph examination scheduled after recruiter call	In-person Pre-Employment Polygraph (PEP) in Calgary at Step 6 ($500 + GST fee)
Psychological / Suitability Eval	Pre-offer Job Suitability Assessment (JSA) and post-offer medical PJSA (both virtual options)	Psychological Evaluation (Step 12, pre-conditional offer)	Confirm in your official posting
Background & References	Investigator interview, character, driving, drug, work, criminal, and reference checks	Fingerprints (within 7 calendar days of exam) and Background Check (Step 13)	Minimum 3 professional references including current employer at Step 8. Selection Committee at Step 9
Post-Conditional Offer Checks	NFPA 1582 medical with VO2 max, medical PJSA, fingerprinting, hair follicle drug screen	Conditional Job Offer at Step 14, followed by Academy Orientation	5-year Driver's Abstract (max 6 demerits), Criminal Record Check, Vulnerable Sector Check, medical and VO2 treadmill test

Stage 1: The Personal History Statement (PHS) and Background Questionnaire

Deadlines at this initial stage are strict. In Denver, once selected for further screening, you must submit your completed BHQ electronically within 5 business days or your application is disqualified. The BHQ covers general personal information, motor vehicle records, education and training, work experience, drug and alcohol use, military service, legal information, and personal and professional references.

Calgary's Personal History Statement (Form FD 1242, dated February 2020, over 6 years old) is a 43-page, 104-question document that instructs you to provide specific information, full details, and dates as far back as you can remember. You are told not to limit your answers to the past 3 years unless a specific question asks you to, and not to assume an incident is too minor to include, as Recruitment Officers review your answers to make that determination.

In Calgary's PHS, Question 15 requires you to fill out a lifetime drug matrix with exact numbers and dates rather than words like 'numerous', 'many', or 'several'. To calculate lifetime occurrences, the form instructs you to multiply your frequency per year by the number of years of usage, and then write out dates and circumstances for every usage. Across its 104 questions, the Calgary PHS asks about:

Previous pre-employment or criminal polygraph and Computer Voice Stress Analyzer (CVSA) tests (through Question 2)
Driving and insurance history, including a valid non-probationary driver's license (Question 3), past licenses in other jurisdictions, suspensions, hit-and-run involvement as a driver or passenger, impaired driving in the past 3 years, police pursuits, accidents, driving unlicensed or uninsured, and photo radar or traffic tickets (through Question 14)
Illegal soft and hard drug usage, pharmaceutical or over-the-counter drug misuse, purchasing, selling, giving away, growing, manufacturing, importing, steroid purchase without a prescription, associating with drug users, and transporting or storing illegal drugs (through Question 26)
Financial and credit history, including bankruptcy, collection agencies, Non-Sufficient Funds (NSF) checks, and current debt or financial difficulties (through Question 31)
School and employment habits, including academic misconduct, unexcused absences in the past 12 months, unemployment gaps over 1 month, undisclosed jobs in the past 10 years, unreported cash income, workplace discipline, dismissals or forced resignations, and lying to an employer (through Question 40)
Prostitution, illegal sexual activity, and use of force, including domestic or adult physical altercations, fights with police officers, road rage or bullying, and weapon use (through Question 65)
Theft and workplace criminal behavior, including shoplifting, taking office supplies or merchandise, and buying or possessing stolen property (through Question 70)
Technological crime, including unauthorized wireless access, cracked commercial software, and illegally obtained digital property such as music, movies, or games (through Question 80)
Undetected criminal activity starting at Question 81, plus fraud, falsifying customs or tax documents, gang or extremist associations, property damage, police contacts, security clearance refusals, prohibited weapons, and adult criminal charges or convictions through Question 104

Stage 2: The Firefighter Polygraph and Amending Mistakes

If you realize after submitting your form that you misread a question or forgot an incident, both Calgary and Denver publish formal procedures to fix the record before your polygraph. In Calgary, if you recall additional relevant details or incidents after submitting your application, you can amend your responses by uploading a PHS Update Form to your online applicant file. In Denver, you must notify the Civil Service Commission in writing at CSCInfo@denvergov.org of any changes to your supplemental application or BHQ information. If you answered an application question incorrectly and were disqualified because of your response, Denver's Candidate Resources FAQ states that you can email a written request for reactivation to the Executive Director through CSCInfo@denvergov.org with the question you answered incorrectly, the reason the answer is incorrect, supporting documentation, and your contact information.

A June 2025 Denver Auditor report (over a year old) defines a polygraph exam as recording physiological changes in a candidate, such as breathing or heart rate, so that potentially dishonest answers can be recorded and reviewed during the hiring process. In Denver, the polygraph reviews your qualifications and suitability and covers areas including previous work experience, previous disciplinary actions, and criminal activity. While Denver allows out-of-state applicants to complete their written test, BHQ, and suitability assessments remotely, and their CPAT, drug screen, fingerprinting, and post-conditional medical exam at a location near home, every firefighter applicant must travel to Denver to complete the polygraph in person with one of the Commission's approved vendors. In Houston, the Applicant Roadmap places a telephone interview with a recruiter at Step 11, right after you submit your Applicant Questionnaire at Step 10, focused on preparation for and scheduling the polygraph examination.

In Calgary, the Pre-Employment Polygraph (PEP) takes place in person in Calgary at Step 6, immediately after your Step 4 PHS review and Step 5 in-person panel interview. Applicants pay a fee of $500 plus GST for the polygraph exam. Calgary's PHS warns that minimizing, blaming, and failing to accept responsibility are closely monitored, and that deceit, dishonesty, or non-disclosure concerning questions in any part of the application process will likely result in disqualification from current and future employment competitions. Calgary also notes that if an applicant admits to having committed a serious and undetected criminal offense (such as murder, crimes involving children, sexual assault, domestic violence, child pornography, robbery, or arson resulting in loss of life or substantial damage) or poses a serious risk to the safety of others, the department may disclose that information to law enforcement or child protection agencies.

Stage 3: Job Suitability, Psychological and Medical Evaluations

Firefighter candidates often encounter two different psychological steps: a pre-offer behavioral suitability evaluation and a post-conditional offer medical psychological evaluation. Before a conditional offer is made, Denver candidates complete the Job Suitability Assessment (JSA), a non-medical evaluation that uses a battery of written tests and an interview with a licensed psychologist to determine if you are at significant risk for employment concerns as a firefighter. You must receive an acceptable rating to continue:

Suitable: Indicates your personality traits and behavior patterns are not expected to interfere with the performance of essential job functions.
Marginally Suitable: Indicates there is concern that your personality traits and behavioral patterns will interfere with the performance of essential job functions.
Unsuitable: Indicates that you are not suited for a public-safety position.

Post-Conditional Psychological and Medical Checks

After you pass the background investigation, Commission Deliberative Review, and Department Review and accept a conditional job offer in Denver, you complete the Psychological Job Suitability Assessment (PJSA). The post-conditional PJSA is a medical evaluation used to ensure you do not pose a direct threat to the health and safety of others. In Denver, both the non-medical JSA and the medical PJSA can be completed remotely.

Alongside the post-conditional psychological check, Denver conducts an in-person Physical Medical Evaluation at the City's expense based on National Fire Protection Association (NFPA) 1582 standards with added VO2 max testing, fingerprinting, and a hair follicle drug screen. If the hair follicle analysis detects a controlled substance, you are disqualified. If a prescription drug is detected, you must provide proof that a physician prescribed it to you or your conditional job offer will be rescinded. In Calgary, medical and fitness requirements at the Conditional Job Offer stage are based on the NFPA 1580 Standard and include a treadmill VO2 assessment where you must reach a minimum of 12 minutes and 30 seconds while wearing an oxygen-measuring mask.

Stage 4: The Background Investigation, References and Oral Board

Once your questionnaire, polygraph, and initial suitability checks are in, a background investigator compiles your complete file. In Denver, background investigators interview the candidate and review character, conduct, driving history, drug use, employment history, criminal history, and references. Lateral firefighter applicants in Denver must have at least 3 years of full-time paid firefighting experience (excluding academy training) and submit all applicable training records and 3 years of their most recent department evaluations.

In Calgary, Step 8 requires a minimum of 3 professional references, including your current employer, and personal references from family or friends are not accepted. In Denver, personal and professional references and letters of recommendation are considered during the background investigation, when applicants provide names, contact information, and relationship details. However, Denver enforces a strict rule against soliciting preferential treatment (lobbying): having a department member, City Council member, city official, or outside reference intervene on your behalf outside the normal background investigation process can result in disqualification.

Your oral board answers sit in the same file that goes to the final hiring authority. In Denver, the 5-person Fire Department Panel Interview results are reviewed alongside your background and testing results during the Commission Deliberative Review and the Department Review by the Executive Director of Safety. In Calgary, a summary of all previous stages (including your PHS, your STAR-format Behavioral Descriptive Interview, your polygraph, and your reference checks) is compiled for the Selection Committee at Step 9. As you review common firefighter interview questions and sample answers, firefighter scenario and ethics questions, and how to explain why you want to be a firefighter, make sure any workplace conflict or mistake you discuss matches what you wrote on your PHS.

Official Disqualifying Factors and Lookback Windows

In Calgary, applicants must be at least 3 years clear of any detected or undetected criminal activity, have fewer than 6 demerit points on a 5-year driver's abstract, and hold a pardon or record suspension for any criminal convictions. Calgary's PHS notes one exception for experimental illegal soft drug usage (defined as pre-legalization marijuana, hashish, hash oil, cannabis extracts/topicals, and mushrooms): applications revealing no more than 1 usage within the last 12 months and no more than 3 total usages in the 3 years prior to application may be considered. Any hard drug usage within 3 years of application is not accepted.

In Denver, entry-level applicants are ineligible if they have any misdemeanor conviction that presents good cause for denial of an Emergency Medical Technician (EMT) certificate under the Criminal Conviction Policy of the Colorado Department of Public Health and Environment (CDPHE) Emergency Medical and Trauma Services Section. Note on Denver's lookback start dates: Denver's Entry-Level Firefighter Informational Booklet from May 2025 (over a year old) and Lateral Firefighter Informational Booklet from January 2026 publish the same disqualification periods, but the entry-level table measures several time-limited criminal, drug, and traffic windows from the date of charge or citation, whereas the lateral table measures them from the date of conviction. Always confirm the exact rule in Commission Rule 3 and your current job posting.

Category	Offense or Reason	Disqualification Period	When You Can Reapply
Criminal History	Any adult felony conviction (or juvenile offense classified as a felony/misdemeanor if committed as an adult)	Permanent	Never
Criminal History	Misdemeanor domestic violence, assault, menacing, stalking, harassment, sexual assault, prostitution, pandering, or indecent exposure	Permanent	Never
Criminal History	Child abuse/neglect with injury, bias-motivated crime, cruelty to animals, resisting arrest, impersonating a public servant, obstruction, false reporting, or perjury	Permanent	Never
Drug Use & Offenses	Illegal distribution, sale, or manufacture of hard or soft drugs (or synthetic marijuana/Salvia) as an adult	Permanent	Never
Drug Use & Offenses	Use, sale, purchase, or possession of marijuana, medical marijuana, or edibles at the time of application	No time limit	Next job opening
Traffic & Driving	Multiple DUI or DWAI offenses	Permanent	Never
Administrative & Testing	Examination dishonesty (cheating on an examination)	Permanent	Never

Practice Oral Board Question: Owning a Past Workplace Mistake

On both the Personal History Statement (such as Question 38 on Calgary's PHS) and the department oral board, you will be asked about times you were disciplined or made a mistake at work. Never minimize the event, blame a supervisor, or tell a story that contradicts your written packet.

Question: Tell the panel about a time you were formally disciplined or corrected by a supervisor at work, and how you handled it.

Example answer (written by Ten-Four as a model, not from a real candidate): 3 years ago, while working as a warehouse shift lead, I received a written reprimand for failing to complete a forklift battery safety log before signing out at the end of a busy Friday shift. Nobody was hurt, and the equipment was undamaged, but I had rushed the closeout checklist so my crew could leave on time. When my manager wrote me up on Monday morning, I accepted the reprimand without making excuses. That disciplinary action was completely justified because the checklist existed to keep the morning crew safe. I disclosed this exact reprimand on my Personal History Statement. After that incident, I changed my closeout routine so that I started the equipment walk-through 20 minutes before the end of the shift instead of waiting until the last 5 minutes. Over my remaining 2 years at that company, I never missed another safety log and was later trusted to train new hires on shift closeout procedures.

Why it works: It names the exact incident and date, matches what was disclosed on the written Personal History Statement, accepts full responsibility without minimizing or blaming others (which Calgary's PHS specifically warns is monitored), and shows the concrete habit change that followed.

Practice this out loud. Ten-Four is AI oral board practice: its panel asks you these questions out loud and follows up on what you missed. You get a 1 to 5 score with the points you made and missed, and a dated plan up to your board. 7 days free. Start a firefighter mock board

FAQ

Do firefighters have to take a polygraph test?

Yes, many career fire departments require a pre-employment polygraph examination. As of 2026, the Denver Fire Department, Houston Fire Department, and Calgary Fire Department all include a polygraph step, and both Denver and Calgary require candidates to complete the polygraph in person.

What does a firefighter polygraph and background questionnaire cover?

In Denver, the Background History Questionnaire and polygraph cover personal information, motor vehicle records, education, work experience, workplace discipline, drug and alcohol use, military service, criminal activity, and references. In Calgary, the 104-question Personal History Statement covers driving history, lifetime soft and hard drug matrices, finances, employment habits, use of force, theft, technological crime, and undetected criminal activity.

What is the difference between a firefighter suitability assessment and a psychological evaluation?

In Denver, the pre-offer Job Suitability Assessment (JSA) is a non-medical evaluation using written tests and a psychologist interview to rate your behavioral traits as Suitable, Marginally Suitable, or Unsuitable. After you receive a conditional job offer, Denver administers the medical Psychological Job Suitability Assessment (PJSA) to ensure you do not pose a direct threat to the health and safety of others.

Will a DUI or past drug use disqualify me from becoming a firefighter?

In Denver, multiple DUI or DWAI offenses or adult drug distribution are permanent disqualifiers, while a single DUI/DWAI or illegal hard drug possession carries a multi-year disqualification window. In Calgary, you must be 3 years clear of criminal activity and hard drug use, though experimental soft drug use of up to 1 time in the past 12 months and 3 times in the past 3 years may be considered.

What happens if I forget to list something on my firefighter Personal History Statement?

Intentional non-disclosure or dishonesty disqualifies you, but departments provide ways to fix honest omissions before your polygraph. Calgary applicants can upload a PHS Update Form if they recall additional incidents after applying, and Denver applicants can email CSCInfo@denvergov.org to update their BHQ or request reactivation with supporting documentation if they misread an application question.

How long does a firefighter background check take?

The Denver Civil Service Commission states that entry-level candidates typically complete the background investigation step about 90 days after finishing their written test. The Denver Auditor report found that the background investigator report step averaged 27 days, while reaching the final Eligible Register took 255 days on average.

Related guides

Official sources

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Firefighter Background Check, Polygraph and Psychological Evaluation