When I got hired on to a major metropolitan police department in the 1980's, we went through extensive testing. If you passed the civil service test, you got a 50ish page book to fill out. They wanted to know everywhere you ever lived, every school you went to, every job you ever had. We went through several physical agility tests, psychological tests, intelligence tests, polygraph tests, drug tests, credit checks, several interviews and a background check that took a year and a half. The PD sent investigators to talk to my family, friends, neighbors, former employers, former school teachers, former girlfriends, ect, ect. They sent an investigator to talk to my grandma 1,500 miles from here. And that was just to get into the Police Academy. Several people still washed out and others didn't make it through field training.