@Avi
A lawyers job is to advocate for the interests of the client to the best of the lawyer’s ability. It is NOT against the Code of Ethics top enter a not-guilty plea for a client the lawyer “knows’ to be guilty. The attorney cannot allow that client to take the stand and testify falsely. If the client insists on taking the stand, the lawyer is obligated to meet with the judge and prosecutor in chambers and say that he is opposed to the client testifying and expects it will not be truthful.
Because the standard of criminal doubt is beyond a reasonable doubt, a lawyer with a ‘guilty’ client who pleads not guilty may present alternative theories of the crime which raise doubt.
Here in OOT America a Beis Din usually has to be brought in from the big city at a great expense and non-frum people are not interested. Unlike in Israel, judge here refer to secular mediation venues.