I've done payments too, and I agree. But I'm assuming all the major retailers in the USA (Target/Walmart/Supermarkets) all do this. (And probably more with the data from the register not going through the CC machine).

Absent any information, I just assumed that any supermarket that can handle EBT/SNAP etc was sending transaction details anyway -- the computer will refuse or only partially pay the transaction if any items not elegible for benifits is on the order.