The only real obstacle is apparently religious modesty requirements.
From:
http://www.ynetnews.com/articles/0,7340,L-3752641,00.html
“The biometric database bill, which passed its first Knesset reading in October, suggests the use of smart IDs and passports, based on fingerprints and visual scans in order to prevent forgery of state documents.”
and
“Knesset Member Zevulun Orlev (Habayit Hayehudi) asked the Knesset’s Science and Technology Committee [...]