I was watching the movie ...And Justice for All (1979), and there was a scenario in the movie that I found interesting to compare mine to, and might be the same law for my story. In the movie, a lawyer (Al Pacino's character) defends a client for murder, gets him off, and then the client goes out and does it again. The lawyer, reading about how the new murder was done methodically, realizes it's the same methods used by his client before. So out of moral conscience he calls the police tells him of those similar methods of his client and the police use that as the basis of their investigation which leads to the clients arrest and charge. The lawyer is then under threat of being disbarred for 'betraying a client's trust' as the term that was used in the movie. In my story, the MC, who is a rogue cop who is willing to break the rules in a case, wants revenge on the gang he is investigating after he feels they have gone too far with their crimes and gotten away with them. So he breaks into the law firm of the lawyer who is representing one of the gang members as a client. He figures that the leader of the gang payed the lawyer, since the gang member does not have the type of budget, to pay such a high priced lawyer. If he breaks in and looks at the file of the case, he can find out who payed the lawyer, and thus find out who the leader is likely, or at least a higher up in the gang, that he could use to re-pick up the trail, after it's gone cold, since the client who was in court before, is the only known suspect in the gang. So the MC breaks into the law firm, with a key card. The gang finds out that he has broken in though and go there to stop him from finding out more about the gang in that file. I haven't figured out how the gang finds this out yet, but they will somehow. So they go there to stop him and probably attempt to kill him from finding out too much. They wait in the parking structure of the building, waiting for him to come out. Unknown to the gang, another rogue cop happens to be tailing the one member who is known to police, for other reasons, that are not official assignment and he has not told the police that he is following the one gang member, who is now with the rest of the gang. So the police do not know who this cop is following and why. The rest of the gang members are unknown and have not been printed in the system before. The gang members are all wearing gloves, and only the one's DNA is on file. So as the cop is tailing them, he hears gunshots since the gang has the MC pinned down, and the MC is trapped and cannot leave, but he has his own gun as well, to return fire. The other cop tailing them runs in to stop the gang, since someone is pinned down and goes to assist, but is killed in the crossfire. The gang gets away, and the MC does as well, not wanting the police to know he broke into the law firm, which lead to the events that got the other cop killed, he has to now figure out what to do. However, let's say the gang leader comes to the lawyer at the same law firm again, who represents him, and tells him that his gang killed the cop who's body is in the parking structure of the building. And the reason why they killed the cop, is because they were trying to kill a different rogue cop, who broke into the building to find out too much about the gang. The police investigating the homicide of the cop have no idea what that cop was doing there, so they are going to be looking at the law firm for any help, since the cop was killed right outside of their building, during a break in, although I am not sure if any signs of a break in would be present. Now if the gang leader goes to the lawyer and tells him that he killed the cop in their parking structure cause the cop was trying to stop them from killing the other cop, who broke in to find out too much, would the firm be legally obligated to defend him and not betray his trust? Or would the firm be legally obligated to tell the police the information that the gang leader now told them? Where is the line drawn between betraying a client's trust, and illegally withholding information from the police? Would a law firm still defend a client after he killed a cop at their own building?