Police say an Iowa Department of Transportation driving instructor forced a customer to view sexually explicit images during an exam and then threatened her to keep quiet.

John Wayne Alexander of Ankeny is charged with harassment and felonious misconduct in office, after a 47-year-old woman complained to police about his actions during the Feb. 26 drive.

The woman said the 60-year-old instructed her to pull into the parking lot of a Mills Fleet Farm, where he showed her sexual photos and videos of himself on his phone for 20 minutes.

The customer said Alexander told her she passed the test but not to tell anyone what happened because he would lose his job and he would know who reported him.

Alexander retired in March but has pleaded not guilty.