If you hear your client perjuring him or herself on the witness stand when the opposing attorney is asking questions, you have the following unsavory choices:
(1) Leap up and request a recess to confer with your client (at which point you yell at them in the hallway and tell them to tell the truth);
(2) If that is denied, or your session in the hallway is unsuccessful, leap up and made a motion to withdraw from the case immediately, indicating to the court that you can't say why;
(3) If THAT is denied, you cannot ask the client any questions about the subject matter addressed by the perjury on redirect.
Unfortunately, this makes it really obvious what the lie is.
You only have to do this if you are *sure* your client is lying. The ethical rules do permit a lawyer to resolve all doubts in favor of one's own client.
Are you saying, that only if you have proof that your client is lying? Cause the client might have lied to the Atty and told the truth on the stand. Do lawyers use that 'reasoning' to not act in court? That they are not sure which is the lie? What was told in court, or what was told to them..