Johnson was working as a bouncer at Teezer's bar over the Labor Day weekend and several witnesses testified at the trial that he had also been drinking.
After it closed, Johnson was called out to a fire around 2:30 a.m. but the call turned out to be a false alarm.
A Madison Police Officer, who noticed Johnson at the bar earlier in the night, saw him driving a fire truck back to the station and confronted him after he parked the truck in the garage. Twenty minutes later Johnson took a blood test which showed he had a blood alcohol level of 0.098, just over the legal limit.
Johnson's attorney, Dan Brown, argued investigators couldn't prove Johnson's blood alcohol level at the exact time he was driving the truck. But, a state chemist testified Johnson's alcohol level was likely higher while he was behind the wheel, and the jury agreed with the prosecution, convicting Johnson of driving drunk.
Johnson has been suspended from the Madison fire department since his arrest, but the fire chief tells KELOLAND News he's glad this case is over because he wants Johnson to be a volunteer firefighter in Madison again.
Chief Jerry Johnson says Johnson's been a very good member of the fire department, and Wednesday's guilty verdict doesn't change that. So, even with a DUI on his record Johnson will soon be back to work as a volunteer firefighter.
Johnson is scheduled to be sentenced on January 3. He faces up to one year in jail or a $2,000 fine.