Derby, a redshirt freshman, was arrested on charges of fourth-degree criminal mischief and public intoxication following an incident at an Iowa City bar late Saturday night. Sherriff's deputies responded to a complaint that a man had punched out the window of a bus as he was departing it.
A criminal complaint states that the 20-year-old Derby admitted to punching out the window and said he would pay for the damage. He submitted to a breath test that showed his blood-alcohol level at .120, and he was booked and released that night.
Hawkeyes coach Kirk Ferentz said in a statement Monday that Derby's suspension comes "as a result of his poor decisions this past weekend." Iowa was on its bye week Saturday.
Derby has seen limited action in two games this season, completing 3 of 6 passes for 30 yards. Junior John Wienke will move into the backup role the next two weeks for Big Ten games against Penn State and Northwestern.
Adam Rittenberg covers Big Ten football for ESPN.com. He can be reached at firstname.lastname@example.org