Закон, что дышло: куда повернешь, туда и вышло

The law can be used arbitrarily, as a rule it is in favo(u)r of those who are powerful or have money

Var.: Закон - дышло: куда хочешь, туда и воротишь

Cf: Every law has a loophole (Br.). Every loop has a hole (Br.). The law is like an axle: you can turn it whichever way you please if you give it plenty of grease (Am.). Laws are made to be broken (evaded) (Am.)