On July 6, 2007, Maas was arrested for drug and weapons possession after a traffic stop in East Peoria, Illinois. He was released from jail two days later.
The USA Today reported 7/8/2007: Maas, 45, and a passenger in his Hummer, Sarah J. Murphy, 27, were arrested late Friday by Illinois State Police. During the stop on Illinois Route 116, police indicated that Maas seemed nervous, which prompted police to request a search of the vehicle, to which Maas consented.
The search turned up a .22-caliber revolver, five grams of suspected marijuana, six grams of suspected cocaine and 28 pills of Ecstasy, according to police. Both Maas and Murphy were charged with possession of a controlled substance and possession of marijuana. Maas was also booked on a charge of unlawful use of a weapon.
On September 5, 2007, Maas was questioned and released following an incident at Kansas City International Airport in which authorities reportedly found a loaded 9mmGlock in a bag brought by the former football player to the airport before attempting to board a plane. The gun was confiscated at a screening station and Maas was taken to the airport police station for questioning, at which point he claimed to have picked up the wrong bag before coming to the airport. The incident is still under investigation.