A social worker prepares to roll out with an officer at Denver Police District 5 on December 21, 2017. Denver has been a model for other cities, including Philadelphia, trying to create new ways to respond to emergency calls involving mental illnesses or drug addictions. AAron Ontiveroz/AAron Ontiveroz/Denver Post via Getty Images hide caption
ncG1vNJzZmivp6x7r7zRZ6arn1%2Blv7Cz0ZqkrGeRobluwMeipaCrXZi8r7%2FInZyrnZRkf3F%2BkmhoamdgbnxyfpBqbXBqZ2yAcK3LpWStoJmjtLR5wqilrKGUmr%2BmsIyfpqtlnqTDprnBnqlmcV1nfXN%2F