We ask for ID when it comes to controlled drugs and trust me sometimes you get some hostile responses, imagine if we did it for everyone
I remember signing for diamorph? or some similar patch type thing that was stronger than the liquid morphine my mum was on at times.
Mainly because of the surprise factor, I can't remember if they asked for ID, but it's the chemist we'd been going to about 3 times a month for years so they know my ugly mug and that I was a regular for picking prescriptions up (in my mum's case often a carrier bag full as their paper bags were too small).
Given some of the people I've seen go in and get shirty about relatively minor things I can imagine how hostile they could get.