It’s been two years since Daniel Prude was killed by  Rochester police . He had been experiencing a mental health emergency when his brother called 911, desperately seeking help. But instead of being met with medical professionals and support, Prude was immediately put into handcuffs and a demeaning “ spit hood ,” even though he was unarmed and had complied with officers’ every demand. He was repeatedly mocked as he was forced to kneel, naked, on the freezing asphalt. Three officers then felt the need to clamber on top of Prude, pinning his face and body into the ground until he stopped breathing and was later declared brain dead. The medical examiner ultimately  ruled his death a homicide . What Prude experienced is horrific and far from isolated. People living with untreated mental illness are  16 times more likely  to be killed by police than the general public. And even the most conservative estimates show that  nearly 1 in 4  fatal law enforcement encounters involve an...