The process is straightforward. First a general interview asking if you do any drugs, they run through a list of some very spefic drugs and ask you specifically about any usage of all of them. A thorough review of past job history and what your former supervisors would say. Following that there is a behavioral survey, quite long. It's fill in the bubble but it is all specific questions about your behavior and how you handle certain things. Beyond that there is a drug test, followed by a security specific IACLEA handbook.