(a) In a proceeding under this chapter, the certified breath test technical supervisor responsible for maintaining and directing the operation of the breath test instruments in compliance with department rules, in lieu of appearing in court, may attest by affidavit to:(1) the reliability of the instrument used to take or analyze a specimen of a person's breath to determine alcohol concentration; and(2) the validity of the results of the analysis.(b) An affidavit submitted under this section must contain statements regarding:(1) the reliability of the instrument and the analytical results; and(2) compliance with state law in the administration of the program.(c) A certified copy of an affidavit prepared in accordance with this section is admissible only if the department serves a copy of the affidavit on the person or the person's attorney not later than the seventh day before the date on which the hearing begins. Acts 1995, 74th Leg., ch. 165, Sec. 1, eff. Sept. 1, 1995.