Paul Bernardo’s lawyer went into the perp’s house and retreived hidden video tapes after his client told him where they were - and after the police had thoroughly searched the house. He pushed up a light fixture in the bathroom and they were in the ceiling.
He held the tapes for 17 months before disclosing them. Meanwhile, Bernardo’s wife played the “I’m a battered wife, I did what I was told” routine. She made a plea deal with the prosecutor, and got 10 years for raping, killing, and dismembering two teen girls. The lawyer’s argument was that the tapes showed she was as much the instigator as her husband, if not moreso.
The prosecutors were so incensed at been shown up as total idiots, they prosecuted the lawyer for obstruction. He got off. You can’t prosecute a lawyer for what his client reveals to him.
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The only “gotcha” is that the lawyer, as mentioned above, cannot lead questioning that he knows will result in perjury. Some lawyers get by this with “tell us in your own words what happened” rather than asking “did you kill her?” if they know the answer will be a lie.
(If they don’t know what the answer is going to be when they ask the question, they should be disbarred for gross stupidity.)
Plus, they cannot conceal a future crime. IIRC the lawyer does not even have a duty to disclose any evidence to the prosecutor (i.e.tapes) although they must turn it over if specifically subpoena’ed. The lawyer only turned them over, I think, when Bernardo fired him and he had no right to hold on to them.
The lawyer cannot be asked to testify about what their client told them.
IIRC (any lawyers out there?) simply knowing someone committed a crime, or even someone confessing to you, is not something you are obliged to tell anyone, whether you are a lawyer or not. The only thing you cannot do is actively hide the fact - lie to police (i don’t know if he did it) or burn, shred, or bury or otherwise dispose of evidence that they may be looking for. However, if the police or prosecutor investigators never ask you about the case, you do not have to tell them. (I believe this does not apply to the defence investigators? They are not “justice”, you are not obstructing? )