what we call biometrics making measurements based upon the position of the venous structure in the hand and if the two patterns match, you can then say, well, it's the same person. it's very easy to exclude. it's a little harder to include a person as the source. >> how in the world can you look at somebody's wrist? i'm looking at my wrist, my wrist looks like your wrist. aren't our veins in similarly placed positions? how can you tell my vein is the vein in the picture. >> it's not only the veins but the branching of the veins, the position of the veins. there have to be mathematical algorithms worked out. this is not something -- this was based on science and mathematics but it is still a question in the courts, is this going to be admissible in the courtroom. it may be reliable stisktcally but that has to be proven. then the judge has to decide