DUI arrests are on the rise in Petaluma. New data shows there were 28 DUI arrests in October. Petaluma police arrested nine people on suspicion of drunk driving last Wednesday night and Thursday morning, during a time known as ‘Blackout Wednesday.’ The arrests, made in a 12-hour period, were the most DUI arrests in Petaluma on any single day this year. A Petaluma Police Department spokesperson says most of the arrests happen in downtown and along the Washington Street corridor.