Local CVSs have been writing your name and last 4 digits of the card (and type of card...) on a chart/clipboard. Ive asked each time how often i can come back and i've been told it's just to monitor once a day.

One however told me that after your name is on the list, you will need to get manager approval for all future purchases. She even said it's now required "by law" that they do it... highly doubt that but whatever, i got my stuff and went on my way.