From our company info:
The CHRC looks for conviction (or a finding of not guilty by reason of insanity) for 28 specifically designated crimes, going back 10 years. Those crimes are listed on the form you sign before getting fingerprinted. If an employee has been convicted of one of the designated crimes in the last 10 years (or found not guilty of the crime for reasons of insanity), he or she is to be denied access to all secured areas. An arrest for one of the designated crimes will not result in denied access, but does require a further investigation to ensure there was not a conviction.