My sister in law is a public defender, she has managed to get cops that lie under oath fired. We're not talking capital crimes here, we're talking stupid traffic citations where the officer would rather lie than admit they made a bad call.
Her belief is that lying is like cocaine, you use it once to get through the case because you know that even though its not strictly the truth the right thing will happen, and then you use it because you really didn't prepare enough, and suddenly its not a 'big deal' in your mind, after all these are people committing crimes right? We're protecting the 'good' people from these scumbags. And you lose yourself.
Exceptionally sad.