In which case can a warrant issued by a mayor be executed in another county?

A warrant issued by a mayor can be executed in another county when it is endorsed by a judge. This provision ensures that the warrant has been reviewed and approved at a higher level of authority, which is necessary for its execution outside the issuing jurisdiction. The endorsement by a judge legitimizes the warrant beyond the boundaries of the mayor's jurisdiction, allowing law enforcement in other counties to act on it.

Other options do not hold the same validity regarding warrants. For instance, simply committing a federal offense does not change the jurisdiction of a warrant issued by a mayor. Likewise, even if a mayor acts as a magistrate, the execution of the warrant in another county still requires judicial endorsement. Lastly, the fact that an accused may have charges in multiple jurisdictions does not inherently provide grounds for executing a mayor's warrant outside of its original county without the proper endorsement.