Albuquerque City Guide

Unmarked Police Vehicle (f-150)?

I was stopped in the Albuquerque area by an unmarked police F-150 (late model) which was fully lit with red/blue, and had a metal toolbox in the bed. The officer was dressed in plain cloths (sport jacket, jeans), and I saw a badge by his pocket. He also checked my license, registration, and insurance. I am wondering what kind of policeman this was?