There's precedent for this; the Federal False Claims Act lets you sue on behalf of the government if you spot someone defrauding a federal program (in this case, perhaps if they take SNAP?). If your suit is succesful you get 15%-30% of the recovery for your troubles. There are "private attorney general" rules on the books at a state level too. I think it's kind of elegant, we can all see that inspections are understaffed, but non-compliance is often not that hard to spot and document. I'd propost that employees should have some whistleblower protection (and relief from NDAs and such) for building dossiers with supporting documentation of criminal fraud.

These provision are called "qui tam" from "qui tam pro domino rege quam pro se ipso in hac parte sequitur", or “who sues in this matter both for the king and for himself.”

I think they suit well with the US's history of bounty hunting, much like class action suits.