He is calling and telling the individual they have missed jury duty and there is a warrant for their arrest. Sergeant Anderson is directing the individual to purchase a form of money transfer (such as moneygram or greendot, etc) from Lowe's, or other places that sell these types of services, and wire the money into a certain account or to the suspect to avoid arrest. Sergeant Anderson is providing the address and phone for the Gallup Police Department in his scam.
The Gallup Police Department is not doing any such enforcement, nor would we call you on your phone demanding payment.
Please share this information and if you have been a victim of this scam file a police report with the Gallup Police Department at (505)722-2002 or (505)863-9365. Our office is located at 451 Boardman Drive Gallup, NM 87301.
Attached are some additional resources:
New Mexico Attorney General Office
Federal Trade Commission