Appointing Authorities may require an employee to be in a trial period for up to one year for individuals who have been initially hired as a state employee, employees who are transferring from one state agency to another state agency, or employees returning to state service following a break in service. The Appointing Authority may not extend the trial period but may adjust the trial period due to extended absence. The length of the trial period shall be made known to the employee at the time of entry on duty and at the time of any adjustment or waiver of the trial period.
Okla. Admin. Code § 260:130-19-30