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  Pursuant to FLSA, employers must generally pay employees working overtime one and one-half times the regular rate of pay for any hours worked in excess of forty a week. 29 U.S.C. § 207(a)(1). However, employees 'employed in a bona fide . . . professional capacity' are exempt from that requirement. Id. § 213(a)(1). The statute does not provide a definition of 'professional capacity,' instead delegating the authority to do so to the Secretary of the Department of Labor (DOL), who defines 'professional employees' to include those employees who are:  (1) Compensated on a salary or fee basis at a rate ...