I don’t know how popular either practice is worldwide; but (aside from overt bribery, which is generally avoided or at least hidden; because it is clearly illegal) there appear to be two basic strategies:
You can be a generous, public-spirited, donor to the local department and/or ‘Patrolman’s Benevolent Association’.
If you have security-guard needs, in home or business, you can make a point of hiring off-duty officers, not with any official understanding that your signing their second paycheck should influence their conduct during the time they are earning their first, of course.
Maybe I’m just cynical; but I’d suspect that anywhere such things aren’t explicitly forbidden, they probably happen.
