This is one of the most important wedding DJ questions that you should ask not only your DJ, but all vendors. We've seen many other DJs, photo booth staff, photographers, and other staff, help themselves to a plate of food and help themselves to the open bar, which we completely do not understand.
We've seen other staff intoxicated, while on the job, and we're always amazed at how they stay in business. We're professionals and we do not drink alcohol and require that all of our staff do not do this, either. We'll gladly accept water or non-alcoholic drinks. :)