Patty Nieberg, Denver-based AP Report For America journalist, pulled back the curtain on ketamine injections, a technique used by police to subdue suspects that played a role in last year’s death of 23-year-old Elijah McClain after a police stop in suburban Denver. Nieberg talked to experts, reviewed medical studies and police policies, and analyzed cases where ketamine has been used. She found a lack of police training, conflicting medical standards and nonexistent protocols that have resulted in hospitalizations and deaths.