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"a series of amendments to the Oklahoma Firearms Act and the Oklahoma Self-Defense Act) conflicted with the federal Occupational Health and Safety Act, which is intended to protect employees in the workplace"

The Federal Health and Safety Act conflicts with the Federal Second Amendment here. Guns in cars in a parking lot do not constitute an immediate threat to worker safety inside a plant. Consequently there is no compelling reason to restrict the Second Amendment rights of plant workers exercising those rights away from their immediate work environment. OSHA regulations could be said to control there only.