Sadly- GZ's past encounters with police over his agressive behavior were not admitted- but we know he had serious problems in the past with self control and agressive behavior.
We just don't know if he was mixing alcohol and adderall, or if he just had violent tendencies naturally.
Somehow I doubt he told his docs about those scrapes with the police- not if he got refills. imho
George wouldn't have had to tell them about prior records. They would have run him through the system and the records would have popped right up.