The FAA recently began using a personality test to screen applicants for Air Traffic Controller positions. So they could have a "more diverse" applicant pool.
It seems that only taking applicants who were either A) veterans with ATC expeience, or B) college educated in the very college program the FAA built (College Training Initiative, or CTI program) didn't give them the "diversity" they wanted.
I've heard anecdotal horror stories about the off the street applicant pool from the FAA Academy in OKC. Drugs and Alcohol. Assaults in the classroom and fights at the approved academy apartments. Washout rate over 50%, and nearing 70% of the applicants with no prior ATC exposure are washing out.
It was such an abysmal failure last year that it was a heated topic during FAA appropriations.