On a 90-degree afternoon in July, under the shade of a tree in Philadelphia's McPherson Square Park, I watched a couple sit down, prepare syringes and inject drugs.
The man injected in his arm, the woman in her neck.
I observed them from about a hundred feet away, where I was getting ready to film an interview with someone else.
After they had finished, the woman rested against the man. She was splayed out on top of the man with her neck tilted back, her mouth open.