There are US organizations that certify the accreditation of foreign schools and universities, and the equivalence of their diplomas. It's the same system used

There are US organizations that certify the accreditation of foreign schools and universities, and the equivalence of their diplomas. It's the same system used by foreign students who apply to an American university. I'm not sure how well this system works, but it does exist, so if there is still space for fraud, just fix the system. Also, once again this is a problem for temp visas with their complex and expensive sponsorship deals; if you just give a green card to any high-skilled worker, if he is incompetent because his education was much below American standards, the guy is fired after the first month, problem solved. (I would support some scheme where such a new GC holder is denied social security benefits in the first X years of residence or Y years of actual employment and tax paying.)