Va. Code § 19.2-394
An inspection warrant may be issued for any inspection, testing or collection of samples for testing or for any administrative search authorized by state or local law or regulation in connection with the presence, manufacturing or emitting of toxic substances, whether or not such warrant be constitutionally required. Nothing in this chapter shall be construed to require issuance of an inspection warrant where a warrant is not constitutionally required or to exclude any other lawful means of search, inspection, testing or collection of samples for testing, whether without warrant or pursuant to a search warrant issued under any other provision of the Code of Virginia. No inspection warrant shall be issued pursuant to this chapter except upon probable cause, supported by affidavit, particularly describing the place, things or persons to be inspected or tested and the purpose for which the inspection, testing or collection of samples for testing is to be made. Probable cause shall be deemed to exist if either reasonable legislative or administrative standards for conducting such inspection, testing or collection of samples for testing are satisfied with respect to the particular place, things or persons or there exists probable cause to believe that there is a condition, object, activity or circumstance which legally justifies such inspection, testing or collection of samples for testing. The supporting affidavit shall contain either a statement that consent to inspect, test or collect samples for testing has been sought and refused or facts or circumstances reasonably justifying the failure to seek such consent in order to enforce effectively the state or local law or regulation which authorizes such inspection, testing or collection of samples for testing. The issuing judge may examine the affiant under oath or affirmation to verify the accuracy of any matter indicated by the statement in the affidavit. After issuing a warrant under this section, the judge shall file the affidavit in the manner prescribed by § 19.2-54.
Va. Code § 19.2-394