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Maryland requires you to be 25 and gives five qualifying experience paths, most of which are police or Maryland-licensed detective work.
Maryland PI license at a glance
| Item | Detail |
|---|---|
| Regulator | Maryland State Police Licensing Division |
| Age | 25, good character and reputation |
| Experience (one of) | 5 years as a full-time certified or licensed Maryland private detective; 5 years as a full-time police officer plus MPTC-approved training; 3 years of investigative work as a detective while a police officer; 3 years of investigative work for U.S., state or local law enforcement in Maryland plus MPTC training; or 5 years as a full-time Maryland fire investigator plus approved training |
| Fingerprints | LiveScan within 30 days of applying |
| Insurance | $1,000,000 commercial general liability if the agency employs 5 or more private detectives |
| Fees | Individual $200; incorporated firm $375; combined detective and guard license $375 (unincorporated) or $750 (incorporated); firm member or representative $42 each |
| Renewal | $200 individual, $400 firm; application due 15 days before expiry |
| Term | 3 years, expiring in January or July |
| Processing | About 90 business days |
What’s different here: the $1,000,000 insurance requirement applies only if the agency employs 5 or more private detectives.
Maryland PI license FAQ
How long is the license valid?
Three years.
How long does approval take?
Allow about 90 business days.
Verified against: Maryland State Police Private Detective Agency License page. Last verified: October 23, 2026.
Who regulates private investigators in Maryland
The MSP Licensing Division administers private detective agency licenses and individual Private Detective Certificates under Title 13 of the Business Occupations and Professions Article. Questions go to the Licensing Division at 410-653-4500.
Maryland PI license types
| License or credential | Who it is for |
|---|---|
| Private detective agency license | Individuals or firms operating a detective business |
| Private Detective Certificate | Individuals employed by a licensed agency |
| Combined detective and security guard license | Agencies providing both services |
How to get licensed in Maryland: step by step
- Get a Private Detective Certificate and work for a licensed agency if you’re new.
- Build the required years of qualifying experience.
- Complete the agency application and background checks.
- Pay the application fee ($200 individual, $375 incorporated, more for combined licenses) and $42 per firm member.
- Provide insurance if you’ll employ five or more detectives.
- Renew every three years ($200 individual, $400 firm).
Carrying a firearm as a Maryland investigator
Carrying a firearm on duty in Maryland requires a Maryland handgun wear and carry permit and compliance with MSP requirements. Check with the Licensing Division before carrying while working.
What a private investigator in Maryland can and can’t do
A PI license is a business license, not police authority. In Maryland, as everywhere in the U.S., private investigators generally cannot:
- Impersonate law enforcement or claim official authority.
- Trespass on private property to watch or photograph someone.
- Obtain bank, phone or other protected records by pretexting, which federal law prohibits.
- Hack accounts, read someone else’s email or install spyware.
- Place a tracking device on a vehicle where state law forbids it.
- Detain or arrest anyone beyond the citizen’s arrest rights every person has.
Recording is a particular trap in Maryland. A 2024 legal summary by the law firm Kilpatrick lists Maryland among the states that require the consent of all parties for at least some recordings of conversations. Never record a conversation you are not part of, and get legal advice before recording calls or private conversations.
Agency license versus individual certificate
Under Business Occupations and Professions 13-301, a person must be licensed by the Secretary as a private detective agency before conducting or soliciting a private detective business in Maryland. An individual or a firm can qualify. Section 13-303 sets the experience routes shown in the table above. For the police-based routes it defines an organized police agency to include certain state and local police departments, qualifying private police departments and qualifying federal and other-state agencies.
The individual Private Detective Certificate is separate. The Maryland State Police page lists a minimum age of 18, disqualifiers such as a felony or crime of violence, narcotics addiction, habitual drunkenness, being a fugitive, a false application or a directly related conviction, and a Livescan and photo dated within 30 days. The initial fee is $15 and the certificate lasts three years, valid only for the agency listed on it.
Certificate renewal is $10, and the application must be filed at least 90 days before expiry. A renewal is late if not received 30 days before expiry, with a $5 per day late fee capped at $150. Processing can take up to 90 business days. Agency renewal timing is different, as shown in the table above.
Building a career as a Maryland investigator
Knowing the rules in Maryland is only the first step. Our guide to becoming a private investigator covers what comes after: building qualifying experience, choosing a niche, a realistic first year, writing reports clients trust, and the most common reasons license applications get delayed. For earnings, see our private investigator salary guide.
Starter gear. A practical starting point for surveillance work is a long-zoom camera such as the Nikon Coolpix P1000 and a pair of binoculars like the Vortex Diamondback HD 10×42. Our private investigator equipment list covers the rest of a starter kit.
Frequently asked questions
Do I need a license to be a private investigator in Maryland?
Yes. Maryland requires an agency license to operate a private detective business and a Private Detective Certificate for detectives employed by agencies.
How long does it take to become a PI in Maryland?
Owning an agency typically requires five years of full-time Maryland detective or police experience (three in some investigative roles). Employees can start sooner with a certificate.
How old do you have to be to own a Maryland PI agency?
At least 25, according to the Maryland State Police.
What is the difference between a Maryland agency license and a certificate?
The agency license lets a person or firm operate a private detective business. The Private Detective Certificate is for an individual and is valid only for the agency listed on it.
How much does a Maryland Private Detective Certificate cost?
The Maryland State Police list $15 for the initial certificate and $10 for renewal.
Sources
- Maryland State Police — Private detective agency license
- U.S. Bureau of Labor Statistics — Private Detectives and Investigators
- Kilpatrick — Wiretap laws in the United States (2024)
- Maryland State Police — Private Detective Certificate
- Md. Business Occupations and Professions 13-301 — License required
- Md. Business Occupations and Professions 13-303 — Experience
Verified against the sources above in October 2026. Requirements and fees change; confirm with the regulator before applying.
Legal disclaimer: This page is for general information and education only. It is not legal advice, and reading it does not create an attorney-client relationship. Security Dogma is not a law firm. Laws, licensing rules and court decisions vary by state and change often, and what is written here may not match your situation or be current when you read it. Before you act on anything here, check the official rules from your state licensing agency, follow your employer’s and client site’s policies, and talk to a licensed attorney in your state for legal questions. See our Terms and Conditions and how facts are checked in our Editorial Policy.
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Security guard work is covered in a separate guide: Maryland’s guard license requirements. You can also compare PI license rules in Delaware with those in West Virginia.