You mail an envelope containing cornstarch to the Maricopa County Sheriff’s Office and put his return address on the envelope.
Only it didn’t quite work out that way. It was previously reported that the MCSO went into lock down Friday when the white-powder-filled envelope was discovered (later reports said that only one floor of the building was evacuated), but it isn’t the ex-boyfriend who is under arrest, but the ex-girlfriend, who has confessed to the prank under threat of being forced to watch the Cold Case Posse’s second press conference repeatedly until she did. Read more at ABC News 15.
This incident reminds me of another where an inoperable black powder bomb was mailed to the sheriff in an attempt to cause trouble for a former business partner. Here’s that story.