one of them I eliminated by defining the rules in such a way that it wouldnt be an issue - the other requires keeping a rotting dead body hidden somewhere.

Part of what a GMI would need to overcome is ensuring that we have an accurate tracking program - a death should trigger an semi-automated removal from the rolls - as in you need to present yourself.

No system is foolproof, and even the best one in the world is going to have upwards of 2-3% fraud - that said the social security administration historically has been VERY good about tracking them down, and remarkably successful at clawing overpayments back.

In the end, by eliminating means testing you close down a ton of venues for fraud.