From: Howard D Trachtman

"Verichip is a small electronic chip, the size of a piece of rice, 
that gets injected into your upper arm.

Hospital personnel can run a scanner over the embedded Verichip and 
by using an ID number in the chip, they can see your medical history 
instantly. They can also see what medications you are taking, 
dosages, allergies, blood type, the name of your doctor, and any 
medical procedures you've undergone. "

  http://www.cbsnews.com/stories/2007/08/01/earlyshow/contributors/emilysenay/main3124051.shtml

www.peoplewho.org