Here, we still co-sign insulin. When I worked in a nursing home years ago, we weren't required to. I can give many critical and potentially dangerous meds, including managing an insulin drip, without co-signing but we are still required to co-sign insulin for regular administration.
Sometimes it is terribly inconvenient to hunt down another nurse to give insulin. And, it seems silly. Maybe we should start co-signing all our meds? After all, we might make a mistake.