The warnings go back nearly 30 years. As soon as a person is handcuffed, get them off their stomach. So says a Department of Justice bulletin from 1995. Yet, people in California continue to die after being held face down by law enforcement.Reporter: Emily Zentner, California NewsroomCalifornia doesn’t know if its efforts to address homelessness are working — despite billions of dollars spent to address the crisis. That’s according to a state audit released Tuesday.Reporter: Vanessa Rancaño, KQED  Learn more about your ad choices. Visit megaphone.fm/adchoices