Following an arrest without a warrant:
In a designated gross misdemeanor case commenced by a tab charge or citation, the complaint must be served and filed within 48 hours of the defendant's appearance if the defendant is in custody, or within 10 days of the appearance if the defendant is not in custody, provided that the complaint must be served and filed before the court accepts a guilty plea to any designated gross misdemeanor. Service of a gross misdemeanor complaint must be as provided by Rule 33.02.
In a misdemeanor case, the complaint must be filed within 48 hours after demand if the defendant is in custody, or within 30 days of the demand if the defendant is not in custody.
If no complaint is filed within the time required by this rule, the defendant must be discharged.
A complaint is valid when it:
Upon the filing of a valid complaint in a misdemeanor case, the defendant must be arraigned. When a charge has been dismissed for failure to file a valid complaint, and the prosecutor later files a valid complaint, a warrant must not be issued on that complaint unless a summons has been issued first and either could not be served, or, if served, the defendant failed to appear in response.
Minn. R. Crim. P. 4.02