What's a petard anyway?
Whatever it is, it seems that at least one food manufacturer is getting some poetic justice. There is a note posted at all the registers in my local supermarket stating that the 14.5 ounce jar of Skippy peanut butter, recently downsized, is not approved by WIC. So in an attempt to save money, apparently Skippy cut off a portion of their business, namely those using food stamps.
It's also interesting to note that, apparently, there are some checks on the use of food stamps since the store is enforcing the edict.