This is a very smart scammer.  They claim to be a cop that is issuing you a warrant for your arrest and failure to show up for jury duty.  They know your full name and address.  They pretty much scare you to death in the most calming way possible to give him money that day to avoid being arrested that day.  This is a scam.  Do not fall for it.  You are only issued this stuff by mail or by person.  And they seem to know the county you are in very well to make it seem as less scam as possible