An area of Maryland employment law not frequently discussed is disciplinary actions taken by Maryland licensing boards. Most such boards function under the Maryland Department of Mental Health and Hygiene. (A list can be found here). Of course, if you are a professional and you lose your license, you are likely to lose your job.
The Boards have broad investigatory powers. In 2004, for example, the Court of Appeals in Doe v. Maryland Board of Social Work Examiners upheld a Board's authority to subpoena the treatment records of all the clients of a social worker who is under investigation by the Board for violations of her professional duties.