I met with the foreman and two people from HR, I was given a drug and alcohol test and they checked my drivers abstract. Given a start date on a Thursday I was to come in on Wednesday for orientation and TDG training. I disclosed I have PTSD and the start date was delayed until I could prove I was not too dangerous to work,(something that would take weeks). I was sent with a letter indicating I would be handling explosives, (strange lube trucks they run).
In short do not disclose anything that they might discriminate against. If you are a vet or a former first responder you may want to know this.