American Bar Association Model Rules of Professional Conduct - Rule 3.5. Impartiality and Decorum of the Tribunal

Rule

A lawyer shall not:

(a) seek to influence a judge, juror, prospective juror or other official by means prohibited by law;

(b) communicate ex parte with such a person during the proceeding unless authorized to do so by law or court order;

(c) communicate with a juror or prospective juror after discharge of the jury if:

(1) the communication is prohibited by law or court order;

(2) the juror has made known to the lawyer a desire not to communicate; or

(3) the communication involves misrepresentation, coercion, duress or harassment; or

(d) engage in conduct intended to disrupt a tribunal.

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See American Bar Association Model Rules of Professional Conduct