Md. Code, Health - General § 3–307

(a) In the performance of official duties, a health officer may enter and inspect any private house if the health officer:

(1) Has obtained consent to enter and inspect;

(2) Has obtained a warrant; or

(3) Does not have time or opportunity to obtain a warrant and an exceptional or emergency situation exists.

(b) In the performance of official duties, a health officer may enter any place of business or employment.