I don't think people in this thread need to teach OP how bribing is bad and plain wrong. He is capable enough to understand the consequences of bribing.
Other than that, Bitcoin has made bribing more easier since it allows anonymous payment and there are hundreds of ways to make your coins disappear after the transaction is complete.
Everything has a good and a bad side and this is just another way Bitcoins can be misused.
Yeah mixer service make it easier because somehow it erases the trace of the two person's bribe transaction. Aside from that it can be done in two different location without banks or remittance service and nullify or at least make it harder to trace the people involved.