CSC Non-exempt Position of Senior Assistant Technical Support interview questions

Phone call to Canada, met his subordinate face to face. Excellent Review. It drug on 3 months with new positions offered to be turned out on the first cut. Skill sets of no brainer type. I got a rescind letter 2 months after my effective start date, 3 after phone interview. Received call from recruiter about another job requiring Secret Clearance with EOD. This is what drew it out, they did not disclose this but kept me in the loop wasting time on interviews I'd never get since security checks were fine. Confirmed when I received copies of the 'reports' they were have difficulty on my background dates being listed. 3 pages first, 21 pages next, you get the idea. Shoot straight, BS Computer Science, was getting AD in Cyber Security. They caused anguish, uncertainty, financial aid problems, losing a funding source I got the next semester again. So if they do that now, what's up after I'm in???