Md. Code, Criminal Procedure § 9–114

(a) The arrest of a person may be lawfully made also by any law enforcement officer without a warrant upon reasonable information that the accused stands charged in a court of a state with a crime punishable by death or imprisonment for a term exceeding 1 year.

(b) When an accused is arrested under subsection (a) of this section:

(1) the accused must be taken before a judge or District Court commissioner with all practicable speed;

(2) complaint must be made against the accused under oath setting forth the ground for the arrest as in § 9-113 of this title; and

(3) thereafter, the answer of the accused shall be heard as if the accused had been arrested on a warrant.