All this enforcement will do little.
Say I get $400 per month in food stamps. I go out and buy $400 worth of food monthly for everyone in my household including the room renter I found on Craigslist. They give me $400 in cash.
I take cash and buy, whatever.
You can feed 2+ people for a month with $400 in foodstamps?
No enforcement would do a lot, none good.