They can detain you at any time if you have a warrant. Call the court& talk with the clerk of the court about a self surrender to the court. They usually wont detain you if the charge is not serious. Eventually you'll get a ticket or something the cops will run your name,see your warrant and you go to jail right then. Better to just go handle it.
Go to court ask to speak with a judge about warrant. They respect that more then getting picked up. Tell them your excuse they will not book you they'll give a court date. Also depends on your charge I've been through this so I know
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