“Under Aadhaar, there is no provision to turn away residents, who come to get themselves enrolled, and the quality of their biometrics can’t be decided by the operators on their own. A violation will attract action,” Sujata Chaturvedi, deputy director general of UIDAI, said in a letter to HT.Given the fact that not everyone has hands, much less fingerprints, this is not a new issue.
See also this article on how UID works with poor quality fingerprints.