Md. Code, Public Safety § 6-311

(a) If in the judgment of the State Fire Marshal testimony taken under oath discloses that a fire or explosion or an attempt to cause a fire or explosion was of incendiary origin or was related to a destructive device, as defined in § 4-501 of the Criminal Law Article, the State Fire Marshal may arrest the suspected incendiary or cause the suspected incendiary to be arrested and charged.

(b) If on investigation the State Fire Marshal has probable cause to believe that a person has committed or has attempted to commit a crime that involves a fire, fire bombing, or false alarm, or that involves the possession or manufacture of destructive devices or explosive substances, fireworks, or fire bombs, the State Fire Marshal may arrest that person or cause the person to be arrested and charged.