29 C.F.R. § 553.216

Although the 1974 Amendments to the FLSA provided special exemptions for employees of public agencies engaged in fire protection and law enforcement activities, such workers may also be subject to other exemptions in the Act, and public agencies may claim such other applicable exemptions in lieu of sections 13(b)(20) and 7(k). For example, section 13(a)(1) provides a complete minimum wage and overtime pay exemption for any employee employed in a bona fide executive, administrative, or professional capacity, as those terms are defined and delimited in 29 CFR part 541. The section 13(a)(1) exemption can be claimed for any fire protection or law enforcement employee who meets all of the tests specified in part 541 relating to duties, responsibilities, and salary. Thus, high ranking police officials who are engaged in law enforcement activities, may also, depending on the facts, qualify for the section 13(a)(1) exemption as “executive” employees. Similarly, certain criminal investigative agents may qualify as “administrative” employees under section 13(a)(1). However, the election to take the section 13(a)(1) exemption for an employee who qualifies for it will not result in excluding that employee from the count that must be made to determine the application of the section 13(b)(20) exemption to the agency's other employees.