Paul Emhoff is accused of exposing himself to a 30-year-old woman last month while riding a West Seattle-bound Metro bus, according to Cindi West with the King County Sheriff's office.
The woman told police she was sitting in the back of the bus on the night of October 17 when a man wearing a suit got on near 3rd and Pike.
She said the man, who was holding a black briefcase in front of his crotch, stood in front of her. At some point during the ride she said the man leaned over and moved the briefcase, exposing his genitals, West said.
The victim yelled, and the man got off the bus soon after, according to West.
Detectives began investigating the case and were able to identify Emhoff as a suspect. The victim later positively identified him, and detectives arrested him on Thursday. He was booked into jail and released the same day.
Emhoff, who has been the district court's chief administrative officer for roughly one month, resigned Thursday afternoon.
District officials say they conducted an extensive background check on Emhoff before he was hired and found no signs of problems.
The case has been referred to the King County Prosecutor, but no charges have been filed.