Hello, Diane. Our org does drive-through food distribution operations. The way we handle it is that we first have new recipients sign up with us using an online form on our website, which then results in their placement in our recipients database. We inform them that when they first come, they will receive a Participant I.D. Card, which they are to display on their vehicle dashboard each time they come. One of our volunteers checks in all vehicles as they drive up, waving on the vehicles with existing I.D. Cards on their dashboard and then handing out cards to the first-time recipients (who are on a list that our checker has). So we can easily tell who is new, and who is returning. Hope this helps.
Carmine, The Food Brigade Inc.