Detective Geoff Stone shifted in his chair behind the witness stand and glanced at the defendants’ table where two former Albuquerque Police Department officers sat. Stone knew the men well. He attended the police academy around the same time as one of the men, Keith Sandy, and worked the same late-night shift on the city’s northeast side with the other, Dominique Perez. But with his two former colleagues on trial for murder after gunning down a mentally ill homeless man in March 2014 during an hours-long standoff in the Sandia foothills, special prosecutor Randi McGinn wanted to know whether Stone’s relationship with the officers was a problem when it fell on him to investigate them. “No,” Stone told her after a moment.