It used to be that simple–so long as you treated all applicants the same without regard to race, religion, etc. Not anymore. Any landlord’s policy regarding criminal history must flexible enough to take into account the severity of the conduct, how recent the conduct occurred, and the rental applicant’s history since. Landlords should also avoid using arrest records (as opposed to convictions). An arrest prove nothing, except that someone was accused.
Read more about criminal history use in tenant screening here.