W. Va. Code § 60-2-17a: Law enforcement cooperation.

In addition to the assistance of law enforcement provided under §15-2-12 of this code, the commissioner may obtain assistance in the enforcement of §11-16-1 et seq. and §60-1-1 et seq. of this code from county or municipal law-enforcement agencies by making a written request therefor. The assistance authorized by this section is limited only to accompanying the commissioner and his or her agents and may not be unreasonably withheld. Any law-enforcement officer acting pursuant to this section may further act upon crimes committed in his or her presence: Provided, That any officer so acting must be within his or her geographic jurisdiction, and nothing in this section authorizes any officer to act outside of the scope of his or her geographic jurisdiction.