I have been having some anxiety over my last experience with blood draw. My 3 year old had to have a blood test and while I tried to calm her down, I forgot to pay attention to the whole process of opening a fresh needle and all that. So, my question is : is it even physically possible to reuse a butterfly needle. Are there some safety devices preventing that? I only saw the whole thing when it was already filled with blood. There was a terrible case when those butterfly needles were rinsed and reused back in 99. I just need some reassurance that it is not possible to do that even if someone was really negligent.