Something else you can do is, write to a major (like Anheuser-Busch) alcohol
company and see if they can provide your establishment with an ID checking
booklet. A few companies release these every year to give door guys an edge
on out-of-state IDs, as it provides high quality pictures and references to
major and minor features on legit IDs from every state. It won't help on good
instate IDs (that pass blacklight and whatnot), but it can help with
out-of-state.
I only mention AB because that's where I got my personal one.