I went to the ER a couple of months ago and was banded by the triage nurse and again a few minutes later by the registration clerk. They didn't come off til I was leaving and had to ASK for them to be cut off!
I really think it's a liability issue--God forbid somebody gets the wrong test/x-ray/med/whatever, or becomes unresponsive for whatever reason. Seems like it should be an automatic thing to band them when they come in--why is it not done? No excuses accepted in court!