Tennessee Code Title 6. Cities and Towns § 6-54-141

(a) As provided in § 38-6-103, the following fees shall be adjudged as a part of the costs in each case upon conviction of the following offenses:

(b) Such fees shall be in addition to and not in substitution for any and all fines and penalties otherwise provided for by law.

(c) Except when and as provided in this section, the appropriate clerk, after deducting five percent (5%) as compensation when applicable, shall identify those fees set out in subsection (a) that are dedicated for use by the Tennessee bureau of investigation and remit the fees to the state treasury to be expended by the Tennessee bureau of investigation as appropriated by the general assembly. These fees shall be transmitted by the clerk of the court to the state treasurer for deposit in a fund to be used by the Tennessee bureau of investigation for the purpose of employing personnel; for the purchase of equipment and supplies; to pay for the education, training and scientific development of employees; or for any other purpose to allow the bureau's business to be done in a more efficient and expeditious manner. The moneys received in the fund shall be invested for the benefit of the fund by the state treasurer pursuant to § 9-4-603. Amounts in the fund shall not revert to the general fund of the state, but shall, together with interest income credited to the fund, remain available for expenditure in subsequent fiscal years.

(d) Upon approval of the director of the Tennessee bureau of investigation, local governing bodies which have the responsibility for providing funding for sheriffs' offices and police departments are authorized to purchase from state contracts approved for bureau purchases, scientific instruments designed to examine a person's breath and measure the alcohol content of a person's breath, for use as evidence in the trial of cases; provided, that prior to use of the scientific instruments, such instruments must be delivered to the forensic services division for testing and certification pursuant to § 38-6-103(g). The bureau shall continue to maintain and certify the instruments and operating personnel, pursuant to § 38-6-103(g), and furnish expert testimony in support of the use of the scientific instruments when required.