As fentanyl crisis evolves, experts say US is still ‘behind the eight ball’

Dallas, United States – Michael Watkins wipes sweat from his brow as he steps up to a stranger’s door. It’s a scorching day in Dallas, Texas; the sun has been hammering the pavement for hours.

Watkins, a 50-year-old man with glasses, a goatee and a gauge in both earlobes, doesn’t know what to expect beyond the door of the single-storey house. He doesn’t even know if the person o...