Chelsea , Massachusetts , is in the middle of a heroin epidemic . The city has been hit hard by overdose deaths and overdoses are on the rise. Deval Patrick declared a public health emergency in Massachusetts . Informants help detectives get drugs off the street . `` You 're constantly pushing back the ocean , basically , '' detective says .
Chelsea , Massachusetts , is in the middle of a heroin epidemic . Gov . Deval Patrick declared a public health emergency in Massachusetts . Informants help detectives get drugs off the street . `` You 're constantly pushing back the ocean , basically , '' detective says .