What this have to do with single-payer? Under single-payer system, there would not be worker comp fraud? Or it won't be investigated, because who cares, it's ot

What this have to do with single-payer? Under single-payer system, there would not be worker comp fraud? Or it won't be investigated, because who cares, it's other people's tax money? I am not sure what your point was here. As long as disability/worker comp fraud happens (and it happens, a lot), it would be investigated. And that's a good thing, because alternative is just common funds (either employer's or taxpayer's) raided by fraudsters without any risk whatsoever. Such system can never be viable.