I would like to give you antoher piece of information.
Security specialist still consider that entering passwords through a keypad is still the best method for high end security. Yes... I too have heard of "glitches" in the biometric access control. All systems must have "tolerances" to allow users to enter certain regions using biometric systems. For example: what happens if I have a litle scratch from the cat on my finger of which I have programmed the biometric system? All biometric device manufacturers would mention of a "tolerance" and that the system will also accept the scratch.
But for password entry systems the code is locked in our head. Unless a technology is developed to read our brains, a high tech criminal cannot get a hold of the password unless we tell them. I know of many ATM's (Automated Teller Machines) in Europe that have remotely been fitted with a device on the entry of the card reader, supported with a CCTV system looking directly at the keypad. Once a user comes along and enters his/her card the small card reading device picks up the card number. Then it is backed by the CCTV system and wala... You have a new credit card number that you can add to your database.
As a warning please check the region where you place your card. Make sure that the entry is not covered by another device. Make sure that the CCTV system does not see your keypad directly.
As long as you you keep your access codes in your head there is very little chance that your code could be hacked. I've seen heaps of Hollywood junk where look for the oil residue of finger prints on the keypad. They are able to "compile" certain numbers or characters from the pressed buttons. Remember to give a different password for each user and change the code every now and then. This posibility would be overcome this easily. We have an access control keypad on our front door that only functions during office hours. If a high tech criminal tries to look for residues on the keypad he/she would see that every button has been pressed. Not forgetting that the system gives off an alarm to CS if a wrong code has been entered more than 2 times.
To prevent high tech criminals from entering your premises you must keep in mind that you cannot prevent an entry with electronic security equipment. All security equipment is used just to warn staff on site. If you wish to prevent unwanted entry you must setup physical structures outside of the premises. Barbed wire fences, walls, proper locks, etc.
I could go on for hours but the main point is to prevent (not just warn) an unwanted guests before they even approach your fancy biometric readers.