If the client has told his lawyer that s/he is guilty, the lawyer is very ethically and legally constrained. They are not allowed to present evidence to the co

If the client has told his lawyer that s/he is guilty, the lawyer is very ethically and legally constrained. They are not allowed to present evidence to the court that they know is false ... which includes not calling a defendant to testify on the stand if the lawyer knows that the defendant is going to lie. The lawyer is basically limited to making the prosecution prove their case.