The Firefighter Background Investigation: What Actually Disqualifies People

By Ryan Coffey, firefighter at the Port of Seattle Fire Department. Six years on the Everett Fire Department hiring panel. Updated November 2026.

The background investigation is the step candidates worry about most and prepare for least. They worry about the wrong things, too.

The background problem that ends a candidacy is often not the thing in your past. It is the thing you did not disclose. A department can work with a mistake from six years ago. It cannot work with someone who hid it.

This guide covers what the investigator actually checks, real disqualifier rules that fire departments publish, and how to walk into the process prepared instead of hoping.

When the background investigation happens

At most departments it comes after the conditional job offer. Seattle runs medical, psychological and background checks after the offer and before the final one. Fremont runs its background after the chief interview and conditional offer.

That timing is important. By the time someone is investigating your background, the department has already decided it wants to hire you. The investigation is checking whether what you told them is true and whether anything rules you out.

What the investigator looks at

Departments publish what they cover, and the lists are thorough. Combined from Fresno, Long Beach, Seattle, Phoenix and Prince George's County:

• Your personal history statement: the long questionnaire about your life. Everything else gets checked against it.
• Employment: current and past employers and coworkers, including part-time and volunteer work. Fresno includes a personnel file review.
• Residences and neighbors: Fresno lists a neighborhood check. Prince George's County lists neighborhood checks too.
• References and relatives: the people you list, and sometimes people they find on their own.
• Criminal history: Long Beach runs criminal checks up to the international level.
• Driving record: citations, accidents and DUIs.
• Credit: Long Beach pulls a sealed Experian credit profile.
• Education: Fresno asks for certified transcripts.
• Military history: including selective service, per Fresno.
• Drug use history: asked directly, and backed by a drug test later in the process.
• Social media: Seattle reviews it, and Phoenix requires applicants to consent to a review of their social media activity.
• Applications to other fire departments: Fresno lists this explicitly.

Read that last one twice. If you told one department something different than you told another, an investigator may see both versions.

The personal history statement is the whole game

The personal history statement is long, tedious, and asks for details you have not thought about in years: every address, every employer with dates and supervisors, every ticket. It is tempting to rush it or round things off.

Do not. The investigator's job is to compare that document against reality. Every gap or mismatch becomes a question, and every question becomes a judgment about whether you are careless or hiding something. Neither one helps you.

Fill it out slowly, with your records in front of you. Keep a copy. Use the same facts on every department's version.

What actually disqualifies people

There is no single national standard. Each department, or its civil service commission, sets its own rules. Here are real examples so you can see how much they differ.

Drug use

Notice Richland. Marijuana is legal for adults in Washington, and the department still published a two-year lookback. Legal in your state does not mean acceptable to the department. Fresno even treats a positive THC test from CBD products as a policy violation.

Criminal history

Austin publishes one of the clearest examples. A felony or a Class A misdemeanor is a permanent disqualifier. A Class B misdemeanor disqualifies for five years, and a Class C for two years.

Driving

Fresno and Topeka list a DUI within three years. The Ohio standard lists a DUI within five years, or four moving violations in three years.

The point is not to memorize these. It is to find the published standards for every department you are testing with and read them before you apply, not after you get an offer.

The disqualifier that beats all the others: not telling them

Look at how departments write about honesty:

• Fresno lists "untruthful or omitted information submitted on the application" as an automatic disqualifier.
• The Ohio standard removes an applicant who "fails to disclose or acknowledge" drug use or any disqualifying behavior.
• Phoenix says failure to provide criminal history information "will result in immediate disqualification."
• Dothan, Alabama says falsified application paperwork "may automatically disqualify" a candidate.

An old mistake might be inside a department's rules. Hiding it almost never is. If something in your past worries you, disclose it, briefly and plainly, with what changed since.

Is there a polygraph?

Sometimes. Dothan, Alabama requires a pre-employment polygraph for all full-time firefighter applicants, and its policy says results cannot be the only basis for a hiring decision. Fresno lists polygraph and/or psychological screening. Seattle, Austin, LAFD, Phoenix and Fremont do not mention one in their published processes.

State law matters here. In Washington, RCW 49.44.120 generally bars employers from requiring lie detector tests as a condition of employment. Its listed exceptions cover law enforcement and a few other roles, and fire departments are not among them. Check the rules in your state and with the department directly.

How to prepare before you are ever asked

You can do almost all of this before your first application goes in:

• Build your history file now. Every address with dates, every employer with dates, supervisor names and phone numbers, every citation, your transcripts, your military paperwork if you have it.
• Pull your own records. Get your driving record, and check your credit report so nothing in it surprises you.
• Tell your references. Let them know an investigator may call, and confirm the contact details you list are current.
• Read your public social media like a captain would. Assume someone from the department will.
• Decide now what you will disclose, and write it down. Short, factual, with what changed since. Then say it the same way on every application.
• Keep copies of everything you submit. Consistency across departments is something you can control.

How long does a background investigation take?

Few departments publish it. Prince George's County, Maryland lists about six weeks per case. Seattle runs backgrounds in June and July for its August academy class, and in November and December for its February class. Your timeline also depends on how quickly your references and past employers respond.

Common questions about firefighter background checks