Note no exclamation point. These are rules, like laws.
Arizona managing general partner wants to institute a stricter code of conduct for players on the DBacks. Kendrick told Arizona Republic columnist E.J. Montini that the team had "quietly" gotten rid of players they suspected of using steroids and other PEDs. Kendrick wanted to institute stricter rules for his team. The players don't think that Kendrick will get his way.
Other rules for teams in the NL West
Giants: You must be over 40.
Dodgers: You must be under 25.
Rockies: You must accept Jesus.
Padres: You must be willing to complain about the size of PETCO Park.