I wouldn't chance it. Stick an "audio may be recorded for performance evaluation purposes" on the drive thru kiosk and call it a day. Otherwise you're inviting

I wouldn't chance it. Stick an "audio may be recorded for performance evaluation purposes" on the drive thru kiosk and call it a day. Otherwise you're inviting litigation when something like this happens. You can want things to be black and white but litigators are going to argue.