6 Va. Admin. Code § 40-20-190
All preliminary breath tests shall be conducted substantially in accordance with the operational procedures set forth in the instruction manual of the manufacturer of the instrument in use except as may be modified by the department.
§ 9.1-1110 of the Code of Virginia.
Former 6VAC20-190-190 derived from Virginia Register Volume 17, Issue 3, eff. November 23, 2000; amended and renumbered as 6VAC40-20-190, Virginia Register Volume 22, Issue 10, eff. February 22, 2006.