Whether or not governing boards establish campus police departments pursuant to the Oklahoma Campus Security Act, nothing in this act shall be construed as prohibiting governing boards from:
1. Employing personnel licensed pursuant to the Oklahoma Security Guard and Private Investigator Act, Section 1750.1 et seq. of Title 59 of the Oklahoma Statutes to be employed as campus security;
2. Contracting with municipalities to authorize their local municipal police department, or with sheriffs departments, or with retired commissioned police officers to provide security services; or 3. Providing courtesy patrols, watchmen, traffic control personnel or other persons for the performance of safety or security duties for which such personnel are trained.