Just been out walking the dog, on our way home we saw a young girl (16-17) lying by the side of the park. No one else anywhere near her.
So I went over to see if she was ok, she wasn't able to focus, could barely hold her head up. So I asked if she'd taken anything, and when she nodded, I asked what. She told me she didn't know.
So I figured it was best to err on the side of caution and ran home (couple of doors away) to grab my phone and call an ambulance.
When I got back her "friends" had reappeared, and were very obviously not impressed at me calling the ambulance.
I feel like it was the right thing to do, but their reaction has made me doubt myself.