Va. Code Ann. § 53.1-49

No department, institution or agency of the Commonwealth shall be allowed to evade the intent and meaning of §§ 53.1-47 and 53.1-48 by slight variations from specifications adopted by the Division of Purchases and Supply of the Department of General Services pursuant to § 2.2-1112, when the articles produced or manufactured in accordance with specifications of the Department are reasonably adapted to the actual needs of the department, institution or agency.