Vigil of Fear - S6.E18

A group of concerned citizens patrol their neighborhood to help keep crime off the streets. After chasing an armed criminal into a warehouse a gun battle takes place and they shoot the man. When examining the body Quincy proves he hadn't fired a gun and was so drunk he couldn't even have stood up at the time. He was not, and could not have been the thief they chased into the building. The vigilantes now look as if they are going to be charged with murder, will Quincy be able to help them?