Here's an excerpt from a press conference he did June 9, 1972,
Here's a transcript of the press conference.
Also!
There is the Elvis-Mary Tyler Moore vehicle Change of Habit from 1969, one of the most grittily gritty movies ever made about New York and drug habits.
Per IMDB:
This movie is a stark portrayal of life among a group of heroin addicts who hang out in "Needle Park" in New York City. Played against this setting is a low-key love story between Bobby, a young addict and small-time hustler, and Helen, a homeless girl who finds in her relationship with Bobby the stability she craves. She becomes addicted too, and life goes downhill for them both as their addiction deepens, eventually leading to a series of betrayals.
Oh wait. That's the description for "The Panic in Needle Park." Sorry.
No, Elvis is a doctor. MTM is a nun. Bring some butter for this corn. "Flapper skirts on a bride of Christ! I don't like undercover nuns." Zing! Here's the first 8 minutes (with Spanish subtitles...) showing some vintage Midtown NYC.