In movies and TV you see heroin users insert a needle, pull blood out, and then inject. 1. Is that how people really do it, and 2 why do they mix blood first?

Question

In movies and TV you see heroin users insert a needle, pull blood out, and then inject. 1. Is that how people really do it, and 2 why do they mix blood first?

In: Biology

Answer 1

Wait what? That’s just the pressure difference on display for dramatic effect isn’t it? I’ve never heard of anyone intentionally doing that.