Disadvantages

From my finding there seems to be more advantages than disadvantages. However I was able to find disadvantages. Organizations that function with computers will be able use this authenticating device. There are certain factors that can affect the quality of the image the devices captures. To name a few such as body temperatures, heat radiation, camera calibration and focus. Also this device is quite expensive and not ready for mass production. it might also be very costly to change the old system to this system and also if there are changes to be made

References:

http://www.docstoc.com/docs/7098475/Vein-pattern-recognition

http://www.ccip.govt.nz/newsroom/information-notes/2006/biometrics-technologies-palmhand.pdf