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Then your lawyer gets arrested.
It sometimes is possible to have laws or guild rules if the prohibited behavior is clear enough that people can't easily fool themselves into thinking they're not violating them. Accepting advice and briefs prepared outside the courtroom is illegal, in this world.
I agree with Alicorn. Even if you pass the law, there's no practical way to stop people from getting private advice secretly, especially in advance of the court date. If you try real hard, private lawyers will go underground (and as the saying goes, only criminals will have lawyers :-) People will pass along illegal samizdat manuals of how to behave in court, half of them actually presenting harmful advice and none of them properly attributed. Congratulations: you have just forced lawyering to become a secret Dark Art.