After watching it, I enjoyed it but had some legal questions in the plot.

SPOILER

When McDeere was being blackmailed by the FBI to work for them, the FBI tells him that 40% of the lawyers who worked at that firm died of young ages if they tried to leave. However, if it's 40%, wouldn't that be enough evidence for the FBI to do some searches without needing McDeere's help?

Also, when they blackmail McDeere, McDeere negotiates the release of his brother as reward for his good service. But when the brother is released, the FBI has plans to arrest him again, once the case is over they said. So why didn't McDeere, being a legal expert, just get a the FBI to get a judge to sign off on permanent release, forever, if they want his help to bust the firm so bad, rather than just temporary release?

McDeere also has himself wired to record what the FBI agent saying. When the FBI agent threatens him, McDeere then uses that to blackmail him back. But is a threat really that much to blackmail FBI agents with, since I assume they threaten people all the time to scare them into cooperating?

Also, McDeere keeps talking about that if he hands over the evidence that the FBI wants, that he would be breaking the law, since he is breaking attorney client privilege by doing so, and that he will be disbarred as a result. Why didn't McDeere try to negotiate immunity from disbarment since he was being blackmailed by the FBI, and it is an FBI negotiation? The FBI would need warrants to get this evidence, so since the evidence is obtained by warrant, wouldn't that legally void any disbarment since McDeere is working for the FBI, getting the evidence, that they would are legally authorized to get anyway... therefore making it legal?

Or how does that work, since the movie never really goes into explanation on that?