(Atlantic, Iowa) – The Cass County Sheriff’s Office reports a man from Dallas County was arrested last week on sexual offense charges. Authorities say on November 5^th, 2024, Cass County Sheriff’s deputies made contact with a female truck driver who was reporting to have been victim of a sex offense while traveling on Interstate 80.

The woman told Deputies that she was traveling East on I-80 near mile-marker 57 (The Olive Street Exit), when a man driving a black Ford F-150 pickup pulled alongside her, matched the speed of the woman’s vehicle, and began exposing himself and his genitalia to her while traveling.  His alleged activities took place off and on for approximately 30 to 40 minutes.

Shawn Assman

Once the man realized that the reporting party was contacting the police, he sped off.  The male subject, later identified as 38-year-old Shawn Assman, of Waukee, was arrested for continuing his alleged activities into Dallas County.  During the investigation, the Cass County Sheriff’s Office worked with the DeSoto Police Department to find that Assman had admitted to masturbating twice before his arrest.

With the victim’s statements along with corroborating evidence from DeSoto Police Department, Assman was charged with Indecent Exposure and a warrant was signed for his arrest.

Assman turned himself-in on the warrant November 7th. He was released after posting bond.