Rule 4-253. Joint or Separate Trials

(a) Joint Trial of Defendants. On motion of a party, the court may order a joint trial for two or more defendants charged in separate charging documents if they are alleged to have participated in the same act or transaction or in the same series of acts or transactions constituting an offense or offenses.

(b) Joint Trial of Offenses. If a defendant has been charged in two or more charging documents, either party may move for a joint trial of the charges. In ruling on the motion, the court may inquire into the ability of either party to proceed at a joint trial.

(c) Prejudicial Joinder. If it appears that any party will be prejudiced by the joinder for trial of counts, charging documents, or defendants, the court may, on its own initiative or on motion of any party, order separate trials of counts, charging documents, or defendants, or grant any other relief as justice requires.
-the procedural issue of joinder/severance and the evidentiary issue of admissibility of other crimes evidence are two distinct, albeit partially overlapping legal doctrines calling for different analysis; Cortez, 220 Md. App. 688