You'd have to have a USDA-maintained database that tracks each feeding instance of each animal in the country, as well as for all imported animals.
That could get kind of unwieldy.
Is there any country that does this currently? What's their system for doing it?
"No bugs" would fit right in.
Adding an 'Animal May Have Consumed Insect Protein' label seems pretty reasonable and low-key.
It might wind up being added as a marketing thing anyway since insect protein is so much more sustainable than other feed sources. It takes like 1,500 gallons of water to make a pound of cow with traditional feedstock. Be nice to move away from that.
I personally think it's cool and would go out of my way to purchase animal products labeled as derived from insect protein.