This is probably off topic but it just reminded me something that happened to me as a naive child. I had bought a watch at Kmart a few days earlier, and it had inexplicably stopped working. So I went back into Kmart to get them to fix it. Then the lady there tried to claim that I had a type of blood that prevented the use of all battery powered devices near my arm.
In retrospect she was probably just too lazy to try and fix it. Does something like this actually exist, and if so would it prevent this cell phone blood testing?