49 CFR 40.93
The screening test technician.
(a) Anyone meeting the requirements of this part to be a BAT may act as a screening test technician (STT), provided that the individual has demonstrated proficiency in the operation of the non-evidential screening device he or she is using.
(b) Any other individual may act as an STT if he or she successfully completes a course of instruction concerning the procedures required by this part for conducting alcohol screening tests. Only the Department of Transportation model course, or a course of instruction determined by the Department of Transportation's Office of Drug Enforcement and Program Compliance to be equivalent to it, may be used for this purpose.
(c) With respect to any non-evidential screening device involving changes, contrasts, or other readings that are indicated on the device in terms of color, STTs shall, in order to be regarded as proficient, be able to discern correctly these changes, contrasts or readings.
(d) The STT shall receive additional training, as needed, to ensure proficiency, concerning new or additional devices or changes in technology that he or she will use.
(e) The employer or its agent shall document the training and proficiency of each STT it uses to test employees and maintain the documentation as provided in § 40.83.
(f) The provisions of § 40.51(b) and (c); § 40.57; § 40.59; § 40.61; § 40.63 (e)(1)-(2), (f), (g), and (h); § 40.69; and § 40.81; and other provisions, as applicable, of this part apply to STTs as well as to BATs.