Umm.....what is a DLS?
FYI, people may not have a driver's license, because they officer who ticketed them for a moving violation too it, but they can still drive with their paper ticket.
I agree it's not safe for anyone not in a car to be in a drive-thru. But how do you enforce that? What about people who drive up in cars, but then their passenger gets out and starts running around for no apparent reason? I guess, just follow your companies policy, if no policy, then I would say serve them as fast as you can and get them out of the drive-thru.