I don't know about work but we used to do that at school ....had an agreement among a bunch of friends that if someone was missing we would sign them in as long as they do it for you if something happened and you were late or something.
I was never a bad student and always had good attendance but there is always that one morning you have a makeup error and over frizzy hair and that is no easy fix problem when your in a hurry, but don't have to hurry because your covered. LOL