Hello,
Thanks for contacting The Community Tool Box. There are a couple of things you can do to make sure people sign in and out for CEUs, but if they do not work, then the responsibility lies with the attendees. First, you can have someone at the entrance asking each person to sign in before they enter the room. Then, when the session begins, allocate time for people to go sign in if they have not already. Also, announce to them that they will not get their credits if they do not sign in AND out. At the end, have only one exit and leave specific time for people to sign out and then leave. You might even end just a little early so you can usher them out one table at a time.And remind them again that if they do not sign out they will not receive their credits.
Good luck with this!
The Community Tool Box Advisor