Ok- I have to share this second hand story from a fellow tech.... Many years ago her hospital had just started allowing preop testing for blood bank. She drew a patient's specimen, then several days later the patient returned for her surgery/possible transfusion. The same tech went to draw a specimen from the patient on the day of surgery, and she said, "You're not the person I drew the other day!" The patient replied, "Shhh. Don't tell anyone. I had a hair appointment so I sent my friend in my place. My beautician's real hard to get into." Unbelievable!!!!