Then you can do this,
B.C. cops caught snorting cocaine, sleeping with prostitutes and drunk driving: police watchdog report
Seriously though, I agree, with the physical test, they should maintain that standard in the department. If a member becomes overweight, he/she should be on desk duty or traffic control.
& Lie detector, I find is B.S. If it isn't admissible in court, then why should it be used to determine candidacy. Sociopaths are good liars, I've read (just saying).
I say, background check, a thorough/multiple interviews, the 30 reference check, and other tidbits should be a good representation of character.