Albuquerque police Detective Herman Martinez had an anonymous tip: a man and woman had warrants out for their arrests, they had been selling large amounts of heroin in the city, and the man had a gun. So shortly after noon on June 28, Martinez and seven other plainclothes officers from the APD Narcotics and Vice units followed Camille Gabaldon, 38, and 37-year-old Greg Chaparro, in unmarked police cars as the pair drove through the city in a maroon sedan. This story first appeared in New Mexico In Depth. It is reprinted with permission. Within an hour, the officers were in another fraught drug investigation — the third such incident involving the Narcotics Unit and street-level users during the last several weeks. The June 28 encounter provides another lens through which to view a New Mexico version of the tension between law enforcement and marginalized communities that is roiling the nation.