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

you draw back on the syringe to make sure you’ve gotten a vein. if you did, you’ll see blood. if you didn’t, you just got muscle or tendon (ouch!), and you don’t want to inject it in anything other than a vein.