When you break a law, say speeding it is sufficient to prove that you were going above the speed limit. Pretty simple. Bribery laws aren't written like speeding

When you break a law, say speeding it is sufficient to prove that you were going above the speed limit. Pretty simple. Bribery laws aren't written like speeding laws, it is insufficient to prove that a official took money or favors and then acted in a manner beneficial to the payer, you must prove that they did so due to the payment specifically. This is virtually impossible so long as they aren't idiots and write the agreement down. One way to enforce this would be to do sting operations from time to time. This was done during the 70's, it was called ABSCAM and they hooked twelve high ranking public officials. Congress got real mad when the FBI did that and it was never attempted again. Must be nice to make the laws.