Easy way to sum it up. When you get the letter/pre employment application then go to 180 and recieve the 21 page booklet follow the instructions and list what they tell you too. In the mean time if you havn't recieved the letter yet start gathering all your info (work history, arrests, convictions, driving history, past drug test results, civil services jobs applied too, etc) from your entire life and you won't have to worry about missing anything. From their all you have to do is follow the instructions in the booklet and you're good to go .