Director means the Director or Acting Director of the National Institutes of Health (NIH), or other officer or employee of NIH to whom the authority involved has been delegated.

Enclave means, unless the context requires a different meaning, the area, containing about 318 acres, acquired by the United States in several parcels in the years 1935 through 1983, and any further future acquisitions, comprising the National Institutes of Health located in Montgomery County, Maryland, over which the United States acquired exclusive jurisdiction under the Act of March 31, 1953, Chapter 158 (1953 Maryland Laws 311).

Police officer means a uniformed or non-uniformed police officer appointed under a delegation of authority to the Director under Title U.S. Public Law 107-296, Homeland Security Act of 2002; any other Federal law enforcement officer; and any other person whose law enforcement services are secured by contract, or upon request or deputation from a State or local law enforcement agency.