Are Maryland investigation and security services required to be licensed?

Yes. To legally conduct an investigation or security services in Maryland, professional private investigation and security providers must be licensed through the Maryland State Police (Phone 410-799-0191). Legal investigation agencies are issued a Maryland private detective license (PDL), and legal security guard companies are issued a Maryland Security Guard License (SGL). If you suspect that a security or investigation provider is operating illegally in Maryland, contact M.I.S.A. or the Maryland State Police.