Tennessee Code Title 41. Correctional Institutions and Inmates § 41-1-118

(a) The commissioner of correction may maintain at least one (1) dog trained to detect marijuana and other illicit substances at each correctional facility in the commissioner's charge; but where more than one (1) correctional facility is located within a county, the commissioner may maintain one (1) dog to serve in the several facilities if this appears to the commissioner to be adequate to locate and detect the substances.

(b) These dogs may be used on a regular basis, or at irregular times and intervals, to survey inmates and areas inhabited or frequented by inmates in order to locate and detect marijuana and other illicit substances. The dogs may also be used to check persons entering into correctional facilities or their grounds to detect the introduction of marijuana and other illicit substances.