I recently went for a blood draw and I saw the nurse getting out the syringe with needle from the wrapping. I am worried about a possible scenario. What if the nurse who took blood from an earlier patient, by mistake, recapped the needle then put it in the wrapper again and with the new needles, and then when she used it on me, she didnt notice that it has been used. Will it be obvious? will there be blood in the syringr or the hub ??