"The commissioner's office negotiated the policy with the union, as it applies to players," he said. "The content of the notice itself was not agreed to by the union."
Titled "Major League Baseball's Weapon-Free Workplace Policy," it says MLB "shall prohibit the possession or use of deadly weapons in any facility or venue owned, operated, or controlled by it." Included are "firearms, explosives, daggers, metal knuckles, switchblade knives, and knives having blades exceeding 5 inches."
Security and law enforcement are excluded, and possession in parking lots is allowed if protected by local laws. Major League Baseball said it is allowed to grant exceptions.
AP freelance writer Mark Didtler in Tampa, Fla., contributed to this report.