(Employees who provided dental care to prisoners in state prison sued for the state’s failure to pay them for the time they spend in security checks before and after work. This decision holds that the complaint’s allegation that security was a principal duty of the employee’s work was sufficient to overcome the state’s demurrer to their FLSA claims under the Portal-to-Portal Act, but that the FLSA claims nevertheless failed because the employee’s union’s memorandum of understanding with the state fully covered hours and wages, barring the FSLA claims. However, the employees’ breach of contract claims survived. The court could not tell at the demurrer stage whether the MOU’s arbitration provision applied to the employee’s wage claims. Their claims were not barred by the statute of limitations under the continuing violation doctrine.)