Some employees are exempt from the minimum wage of the Fair Labor Standards Act (FLSA), but checking the list of exemptions below isn't always enough to be sure if employees duties are exempt or not.
To be sure if duties are exempt employers and employees should always check the exact terms and conditions of an exemption in light of the employee's actual duties before assuming that the exemption might apply to the employee. The ultimate burden of supporting the actual application of an exemption rests on the employer.
Exemptions are typically applied on an individual workweek basis. Employees performing exempt and non-exempt duties in the same workweek are normally not exempt in that workweek.
Source Minimum Wage Exemptions