19 (b) The owner, business or commercial lessee, manager of a
20 private business enterprise, or any other organization,
21 entity, or person may prohibit persons holding a permit for
22 concealed firearms from carrying concealed firearms on the
23 premises and may prohibit employees, not under a collective
24 bargaining agreement, not authorized by the employer, holding a
25 permit for concealed firearms from carrying concealed firearms
26 on the property of the employer.
This is repeated again in the next section. I betting they meant that it couldn't be in violation of the contract if it was specified but this could be interpreted to mean businesses cannot bar Union employees from carrying.