Labor relations — Fair Labor Standards Act — Overtime — Sheriff deputies are not entitled to compensation under FLSA or Florida Minimum Wage Act for time spent donning and doffing police gear at home or time spent driving to and from work in marked patrol vehicles — Even though donning and doffing protective gear arguably may be “indispensable,” it is not “integral” to deputies’ principal activities of law enforcement duties and therefore such time is not compensable — Donning and doffing is an entirely separate activity from deputies’ principal law enforcement duties, and therefore donning and doffing is a preliminary and postliminary activity as contemplated by Portal-to-Portal Act — Time deputies spent commuting in marked patrol vehicle is excluded from compensable work time by plain language of Portal-to-Portal Act — Monitoring roads for traffic violations and other incidents during the deputies’ commutes are incidental to use of marked patrol vehicle and not part of employee’s principal activities — Performance of general traffic law enforcement during deputies’ commutes is not integral and indispensable to deputies’ performance of their principal activities