I am a automotive tech worker. i dont know how a lawyer determines h1b minimum wage but i get paid a lot less than Americans in my company who dont even have a masters degree. Yes its very easy to trick the laws
They won't move fast, but triple damages and a nice fine for your employer can be a sweet reward for their fraud against you.
On a sidenote, the H1B strategy is very common in the Engineering field, most consultancies figure they can get a decade of work at below American wages out of the average H1B visa holder, saving them a few hundred thousand.