Find a Licensed Private Investigator in Maryland

01Why Marylanders hire investigators

When a Maryland matter needs a licensed private detective

Maryland requests range from the Washington suburbs to the mountains and the bay. A Montgomery County parent preparing for a custody hearing wants a record of what happens on the other parent's weekends. A Baltimore manufacturer suspects a manager is leaking bids to a competitor. An Anne Arundel County family is trying to locate a relative who stopped returning calls. A claims adjuster doubts that a worker on the Eastern Shore is as injured as the file claims. In each case the facts must be gathered lawfully and presented in a form a lawyer or judge will accept.

Maryland law treats that work as regulated. Section 13-101 of the Business Occupations and Professions Article defines providing private detective services to include conducting investigations for compensation and securing evidence for use in trials and before investigating bodies. That reaches most of what people mean when they search for a private investigator in Maryland. The first job is finding an agency and an investigator who are both properly credentialed and familiar with the county where the matter sits.

• Divorce, custody and support cases in the circuit courts
• Civil litigation: witness locates, statements and asset research
• Insurance and workers' compensation claim reviews
• Employee misconduct, fraud and business due diligence
• Harassment and stalking documentation for counsel or police

02Licensing

How licensing works for a private investigator in Maryland

Maryland regulates private detectives under Title 13 of the Business Occupations and Professions Article. The Secretary of State Police issues the licenses, and the Licensing Division of the Maryland State Police, through its Professional Licensing Unit, runs the program. Maryland uses two credentials. A business must hold a private detective agency license, and each individual who personally provides private detective services must be certified as a private detective. Certification is tied to the sponsoring agency: an investigator needs a separate certification for each agency they work for, and the State Police describe certification as valid for three years.

Section 13-701 sets out the core prohibitions. A person may not engage in, attempt to engage in, offer to engage in or solicit to engage in a business that provides private detective services in Maryland unless licensed as a private detective agency. An individual may not provide, attempt, offer or solicit to provide those services unless certified. Agency applicants must be at least 25 and show qualifying experience, such as five years as a full-time licensed or certified private detective in Maryland or five years as a full-time police officer, among other routes.

For a client, that structure means two checks: the agency's license and the investigator's certification for that agency. The Maryland State Police agency license page explains the requirements and lists contact information for the Professional Licensing Unit. A legitimate investigator should give you both credentials without hesitation.

03Legal limits

What licensed Maryland investigators can and cannot do

A Maryland license is permission to investigate for pay, not police authority. Licensed investigators cannot arrest, search, compel records or enter private property without permission, and badges are allowed only when the State Police authorize them. Recording is where Maryland is strict. The Maryland Wiretap Act, Courts and Judicial Proceedings Article Section 10-402, makes it unlawful to intercept a wire, oral or electronic communication, and the private-party exception in Section 10-402(c)(3) applies only when the person is a party and all parties have given prior consent. Maryland is therefore an all-party consent state, and a violation can be a felony.

Maryland courts generally apply the oral-communication rules to conversations where the speakers expect privacy, so the details matter. A client should not record a phone call or a private conversation in Maryland without consent from everyone in it, and an investigator should not either. Calls with people in one-party states can raise additional questions, so an attorney can confirm what applies.

Maryland's stalking statute, Criminal Law Section 3-802, covers a malicious course of conduct that can include using a device to track another person's location without their knowledge or consent. Placing a tracker on someone else's car can create serious criminal exposure. Federal law separately bars pretexting to obtain bank and phone records.

• Recording: all-party consent under CJP 10-402(c)(3)
• Covert device tracking can be stalking under Criminal Law 3-802
• No impersonating police or carrying unauthorized badges
• No pretexting for bank or telephone records under federal law

04Regions

Maryland's regions call for different local knowledge

Central Maryland holds most of the state's people. Baltimore City is an independent city with its own circuit court, separate from Baltimore County, whose courts sit in Towson. Anne Arundel, Howard and Harford counties surround them with suburbs, military installations and the BWI corridor. Many of the largest communities, including Columbia, Ellicott City, Glen Burnie and Towson, are unincorporated, so an address may not match a city in court records.

The Capital Region is shaped by Washington, D.C. Montgomery and Prince George's counties are dense, diverse and heavily commuter-based, with federal agencies, defense contractors and Metro lines that cross the D.C. line many times a day. Surveillance and witness work there often has to account for traffic on the Beltway, I-270 and U.S. 50, and for subjects who live in one jurisdiction and work in another.

Western Maryland, from Frederick and Hagerstown to Cumberland and Garrett County, is more rural and mountainous, with long drives between towns. Southern Maryland includes Charles, Calvert and St. Mary's counties and Naval Air Station Patuxent River. The Eastern Shore, reached by the Bay Bridge, runs from Cecil County to Ocean City, where summer crowds change everything. A licensed investigator who knows the region can plan the work efficiently.

05Pricing

How Maryland investigators usually charge

Each investigator sets their own fees, and Delator Group does not set or quote them. Most licensed Maryland agencies bill by the hour for field work, research and report writing, usually against a retainer paid when the agreement is signed. Surveillance often has a daily minimum, and two-person teams cost more than a single investigator. Mileage, tolls, parking and database charges commonly appear on invoices, and Bay Bridge or Beltway travel can add time.

Records research and single-address checks are sometimes priced as a set project, while surveillance and locates are usually estimated in phases. Ask for the estimate in writing, ask what the retainer covers and ask how the agency will tell you before costs exceed it. A written engagement letter that describes scope, methods and reporting protects both sides.

06Preparing

How to prepare for your first call with a Maryland investigator

Gather the basics before the first call. Write down full names, dates of birth, last known addresses, employers, vehicles and phone numbers. Note the county or Baltimore City, the court where any case is pending, the case number and upcoming dates, and have your attorney's contact information ready. Collect copies of relevant documents or messages, but hold them until you have agreed on terms with the investigator.

Know what decision the information has to support, whether a custody filing, a settlement, a hiring decision or a police report. Tell the investigator about any protective or peace orders and any safety concerns. Ask how findings will be reported, whether video is included and whether they have testified in a Maryland circuit court.

• Names, dates of birth and last known addresses
• County or Baltimore City, court and case number
• Vehicles, employers and known routines
• Attorney contact and deadlines
• Any protective orders or safety concerns

Cities

Top 20 cities in Maryland for private investigator requests

These are Maryland's 20 most populous incorporated cities and towns, ranked by the Census Bureau's 2024 population estimates. Some of the state's largest communities, such as Columbia, Germantown, Silver Spring, Waldorf and Ellicott City, are unincorporated census-designated places and are not ranked here. Maryland detective licenses are statewide, but local court knowledge still matters.

Counties

Top 20 Maryland counties for investigator requests

Maryland has 23 counties plus Baltimore City, an independent city that functions as a county, for 24 jurisdictions in all. This list ranks the 20 most populous by current Census Bureau estimates. Each jurisdiction has its own circuit court, grouped into eight judicial circuits, while the District Court of Maryland handles smaller civil claims and many criminal matters.

Investigation types

Investigations licensed Maryland investigators handle

Licensed Maryland private detectives handle personal, legal and business matters across all 24 jurisdictions. These descriptions are general. The investigator you are matched with will explain what is lawful in your situation, how the work would be carried out in your county and what it is likely to cost.

• SurveillanceAn investigator observes and documents activity from public places, keeps a time-stamped log and prepares a report. Because Maryland requires all-party consent, surveillance video is usually captured without audio.Learn more
• Infidelity and divorceInvestigators document relationships, cohabitation or hidden spending relevant to a divorce in circuit court, so the client's attorney can decide how to use the findings.Learn more
• Child custodyInvestigators document parenting time, home conditions and safety concerns for custody cases, coordinating with counsel so the evidence fits what a Maryland judge will consider.Learn more
• Background researchInvestigators review court records, judgments, liens and business filings on people and companies. Reports used for hiring or tenant decisions fall under the federal Fair Credit Reporting Act.Learn more
• Locates and skip tracingInvestigators find witnesses, debtors, heirs and lost contacts through lawful databases, public records and field checks, confirming an address before reporting it.Learn more
• Insurance and workers' compensationFor carriers, employers and defense counsel, investigators document claimant activity and interview witnesses in claims before the Maryland Workers' Compensation Commission and the courts.Learn more
• Criminal defense investigationWorking for defense attorneys, investigators interview witnesses, canvass scenes, collect video and review discovery in District Court and circuit court criminal cases.Learn more
• Corporate and fraud mattersInvestigators look into employee theft, contractor fraud, trade secret leaks and pre-deal due diligence for Maryland businesses, often alongside company counsel.Learn more

How matching works

How investigator matching works in Maryland

1. 01

   Send your request

   Use the contact form or call. Describe what you need, the county or Baltimore City, any deadline and how you would like to be contacted. Keep sensitive details short for now.

2. 02

   We review it

   Delator Group checks the request for completeness and may ask a follow-up question about location or timing. We do not carry out the investigation.

3. 03

   Referral to a licensed investigator

   We refer your request to an independent, licensed Maryland private detective agency that works your region, from the Capital Region to Western Maryland or the Eastern Shore.

4. 04

   The investigator contacts you

   The investigator reaches out to discuss goals, legal limits and cost. Any agreement, retainer and payment are strictly between you and the investigator.

5. 05

   Verify and decide

   Confirm the agency license and the investigator's certification with the Maryland State Police Licensing Division, then decide whether to hire. There is no obligation to go ahead.

Licensing

How Maryland licenses private investigators

Maryland licenses private detective agencies and certifies individual private detectives at the state level through the Maryland State Police. Title 13 of the Business Occupations and Professions Article sets the experience requirements, background checks and the rule that an individual's certification is tied to a licensed agency. The table below summarizes the essentials and shows how a client can confirm both credentials before any work begins.

Before you hire

What to check before you hire an investigator in Maryland

FAQ

Frequently asked questions

Nationwide

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