Section 8 On-Court Conduct
In addition to its authority under paragraph 5 of the Uniform Player Contract, the NBA is entitled to promulgate and enforce
reasonable rules governing the conduct of players on the playing court that do not violate the provisions of this agreement.
CBA page 46
EXHIBIT A
NATIONAL BASKETBALL ASSOCIATION
UNIFORM PLAYER CONTRACT
5. CONDUCT.
(b)The player agrees ... (iii) to conduct himself on and off the court according to the
highest standards of honesty, citizenship and
sportsmanship, and (iv) not to do
anything that is materially detrimental or materially prejudicial to the best interests of the Team or the League.
(d) The Player agrees to be bound by article 35 of the NBA Constitution. a copy of which, as in effect on the date of this contract, is attached hereto.
https://www2.bc.edu/~yen/Sports/NBA%20CBA.pdf page 183
EXCERPT FROM NBA CONSTITUTION
MISCONDUCT
(C) Any player who
makes, gives, issues, authorizes or endorses
any statement having, or designed to have, an effect
prejudicial or detrimental to the best interests of basketball or the Association or of a Member or its Team, shall be liable to a fine not exceeding $25,000 to be imposed by the Commissioner
(d) If on the opinion of the Commissioner
any other act of a Player at or during an Exhibition, Regular Season or Playoff game has been prejudicial to or against the best interests of the Association or the game of basketball, the Commissioner shall impose upon such player a fine not exceeding $35,000, or may order for a time the suspension of any such Player from any connection or duties with Exhibition, Regular Season or Playoff games or he may order both such fine and suspension.
https://www2.bc.edu/~yen/Sports/NBA%20CBA.pdf page 187