lol... I remember the first time I saw a little blood squirt back into the syringe. After reading all these horrible nightmare scenariors, I was a little startled. Let me tell you first off... injecting into a vein in your ass while you re doing the backwards bend into the mirror is very very improbable. Injecting enough straight into a vein to cause you serious harm would be even more difficult (the suspension is pretty thick and would most likely push the vein aside or just straight out burst it). That aside, if you re still alive to read this, then you re in the clear. To correctly check, make sure you pull back very gently before plunging next time. If you do hit a vein, there is usually enough force that the blood will "squirt" into the syringe and its a lot more than a drop.