While in business I hired a cop-killer who had served 18 years for murder. He was robbing lover's lane parkers and the cop was with a lady not his wife and tried to be a hero. That is why a short sentence for killing a cop. He was the best electrician and also the best person that I have ever met. He was one of my top foremen and helped lesser employees constantly. I think people do change and fortunately my experiences have mostly been with those who changed for the better.
