Best Private
Investigators in

Why These Private Investigators?

Our goal is to connect people with the best local experts. We scored private investigators on more than 25 variables across five categories, and analysed the results to give you a hand-picked list of the best private investigators in Baltimore, MD.

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Our Selection Criteria:

  • 1. Reputation

    A history of delighted customers and outstanding service.

  • 2. Credibility

    Building customer confidence with licensing, accreditations, and awards.

  • 3. Experience

    Masters of their craft, based on years of practical experience and education.

  • 4. Availability

    Consistently approachable and responsive, so customers never feel ignored.

  • 5. Professionalism

    Providing service with honesty, reliability, and respect.

AAA Surveillance, Inc.

AAA Surveillance, Inc. is a private investigation firm in Millersville. The agency is licensed by the state to perform undercover surveillance by legally following people and document activities using a video camera. The company provides surveillance services for a range of cases, including adultery, child custody, insurance fraud, and alcohol and drug abuse. AAA Surveillance, Inc. allows clients to pay as the case proceeds rather than post a large retainer, and investigators keep clients updated every step of the process.

Millersville, MD(410) 508-0755


Absolute Investigative and Security Services

Absolute Investigative and Security Services provides private investigative services in the Baltimore area from offices in Towson, Bel Air, and Berlin. Owner Reginald Przybylski is a retired detective lieutenant after 23 years with the Baltimore County Police Department. All company staffers are retired police officers, detectives, police command personnel, and supervisory and management personnel from the private sector. Absolute Investigative and Security Services is licensed throughout Maryland to provide background investigations, polygraph testing, records research, and a host of other investigative services.

Towson, MD(410) 828-6460


Apex Investigative Services

Apex Investigative Services is a private investigation firm with more than 24 years of experience in Glen Burnie. The company’s fingerprint technicians are certified by the Criminal Justice Information System to provide Livescan fingerprinting and ink fingerprinting for FBI cards as well as other state or federal agencies. The agency also uses state-of-the-art equipment to handle all manner of domestic, civil, and criminal investigation. Apex Investigative Services assists clients in divorce proceedings and child custody court cases.

Glen Burnie, MD(410) 590-3700


Aris Investigations

Aris Investigations in Sykesville has more than 35 years of experience as a private investigation firm in the Baltimore area. The agency provides services for all manner of clients, including individuals, law firms, insurance companies, and government agencies. Aris Investigations handles a range of cases, including criminal and civil investigations, process service, and asset verification. The company also provides background checks for pre-employment screening and searches for missing persons.

Sykesville, MD(443) 992-7470


Capstone Protection & Investigations

Capstone Protection & Investigations in Bel Air is a licensed private investigation and security agency with more than 20 years of experience. The company provides investigative services for domestic and family civil matters, including divorces, child custody and abuse cases, and workers’ compensation fraud claims. The company also handles skip tracing and locate services for persons subject to service of process. Capstone Protection & Investigations also provides professional armed or unarmed, uniformed or plainclothes security guards for a range of businesses or events.

Bel Air, MD(410) 921-2700


Castle Security Group

Castle Security Group is a private investigation firm in Baltimore that has served the region for more than 35 years. The agency has developed a reputation for delivering superior service to its clients. Castle Security Group is a member of the World Association of Detectives, the Maryland Investigators and Security Association, and the American Society of Industrial Security. The company performs pre-employment background checks, locates and interviews hard-to-find witnesses, and works with attorneys on domestic litigation and criminal defense investigations.

Baltimore, MD(410) 788-7800


Commercial Index Bureau

Commercial Index Bureau is a private investigation firm that opened in 1967 and has its headquarters in Baltimore, Jacksonville, and Philadelphia. The agency partners with vendors across the country to provide nationwide surveillance services. The company’s eDossier provides a comprehensive background check that includes a Social Security number trace, address verification, and local, state, and national court records checks. The company also performs field investigations, unmanned drone surveillance, and activity checks.

Baltimore, MD(800) 451-0805


Comprehensive Investigations, Inc.

Comprehensive Investigations, Inc. is a private detective firm that opened in Timonium almost a decade ago. The agency specializes in conducting insurance fraud investigations for workers’ compensation and personal injury cases. The firm’s five investigators perform surveillance of claimants and provide photographic evidence of their daily activities and physical capabilities. The company uses a specially designed vehicle equipped with digital video cameras and lenses on its surveillance assignments.

Timonium, MD(410) 252-6511


Cunningham Detective Agency

Cunningham Detective Agency is a licensed private investigation firm in Laurel. Client consultations are by appointment only. Owner Wesley Cunningham is a retired police officer with more than 30 years of experience in law enforcement as an investigator. He previously served as Chief of Security in the federal government. Cunningham Detective Agency is a member of the National Council of Investigation and Security Services. Among the services the firm provides are missing person investigations, surveillance, security services, and process serving.

Laurel, MD(240) 319-8350


DV Investigations

DV Investigations is a professional private detective agency in Baltimore. Owner David Vaughn is a licensed, bonded, and insured private investigator with more than 20 years of experience in law enforcement as a deputy, investigator, and detective. The company specializes in corporate and private sector surveillance services, including ethics and fraud investigations, elder abuse, and human resources cases that range from employment law to workplace violence. DV Investigations also works with law firms on pretrial matters.

Baltimore, MD(443) 613-3247


Fidelity Investigations & Consulting

Fidelity Investigations & Consulting is a private detective agency in Phoenix. The company has several notable success stories, including a federal drug conspiracy case in which its investigators found crucial evidence that showed certain wiretapped phone calls were not made by its client. The company also provides expert surveillance services and investigates civil matters such as elder abuse and asset checks.

Phoenix, MD(410) 667-1117


Freestate Investigations, LLC

Freestate Investigations, LLC is a private investigation and process service firm with locations in College Park, Laurel, Baltimore, and Washington. The company provides legal support services, and its staff of process servers and private investigators are experts in the region’s laws and regulations. The agency handles a range of investigations, including infidelity, asset searches, workers’ compensation claims, and much more. Freestate Investigations, LLC also offers court filing services, document services, notary services, and skip tracing.

Baltimore, MD(410) 525-5080


Protection Security Associates

Protection Security Associates is a professional security and investigative services company in Baltimore. The company provides executive protection, event security, and contract security guards for clients that include the National Football League and the National Security Agency. The company’s private investigation staff includes former law enforcement and military members. Protection Security Associates completes background checks and performs investigations for attorneys, insurance companies, and other clients.

Baltimore, MD(410) 234-9733


S1G Investigations

S1G Investigations is a private investigation firm in Baltimore. The agency has more than three decades of experience handling a range of investigations, including domestic infidelity, missing persons, insurance fraud, and child custody matters. The company can provide 24-hour turnaround on drug testing and background checks for consumers or businesses. S1G Investigations also performs process serving around the world.

Randallstown, MD(866) 765-5499



THE VISA GROUP in Linthicum Heights is a fully licensed private detective and security firm that serves the Baltimore area. The company handles a range of investigations, including corporate cases, criminal and civil matters, missing persons, and background checks. The company also provides armed officers for executive protection and conducts surveillance and GPS tracking for a host of situations. Initial client consultations are free of charge.

Linthicum Heights, MD(410) 691-9708


Titan Investigative Alliance

Titan Investigative Alliance is a private investigation firm with its corporate offices in Columbia. The company specializes in investigating insurance claims, including workers’ compensation, property and casualty, life and health insurance, and auto accidents. Its investigative services include surveillance, compliance reporting, social network and Internet monitoring, and background checks.

Columbia, MD(410) 964-0930


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