Brennan was arrested on July 25, 2012 in Kailua, Honolulu County, Hawaii on suspicion of driving under the influence and third-degree promotion of a dangerous drug. His blood-alcohol level was 0.17 percent, more than twice the legal limit for driving a vehicle. He was released the next day without charges. In August 2012 Brennan was charged with drunken driving but was not charged for cocaine residue found in a plastic packet in the car. Despite entering a not guilty plea in November 2012, Brennan pleaded guilty to driving under the influence of alcohol on July 31, 2013 and paid a $300 fine.