13-64-1 School board may implement school sentinel program. 13-64-2 Approval of law enforcement official required. 13-64-3 School sentinel training course. 13-64-4 School employee right to refuse to carry firearms. 13-64-5 Permit to carry concealed weapon required. 13-64-6 Cause of action against school board. 13-64-7 Referendum petition on school board decision. 13-64-8 Time for filing petition. 13-64-9 Contents of petition. 13-64-10 Requirements for petition. 13-64-11 Election on referendum. 13-64-12 Publication of referred decision. 13-64-13 Ballots on referendum. 13-64-14 Majority vote required--Effective date of approved decision. 13-64-15 Immunity from liability. 13-64-16 Sovereign immunity not waived.