UK Border Force seem to be very free and easy, they just take a glance at my controlled medication, and say 'you're OK, off you go'. In most other countries they have to go and look it up on a database to be sure I'm not trafficking a dangerous drug across the border. Sniffer dogs always detect it.
My ex-wife (Maiden name: Escobar. Place of Birth: Medellin, Colombia) always used to get the full treatment wherever she went. What was ironic is that she works for the CSIS, specifically tasked to keep cocaine out of Canada. The smell of cocaine sticks to your clothes for ages, so if she'd been involved in a seizure of say kilogrammes of the stuff, she'd get picked up by the sniffer dogs for up to a month afterwards.