Aadhaar can act as a digital wall capable of preventing the re-entry of illegal immigrants into the system once their enrolment has been cancelled, a top official of the Unique Identification Authority of India (UIDAI) has told NDTV. Responding to media reports on Rohingya migrants getting their hands on passports and Aadhaar cards, UIDAI Chief Executive Officer Ajay Bhushan Pandey said they are putting together a mechanism that will facilitate the cancellation of such illegally acquired documentation when approached by police and other government agencies. "We can not only cancel Aadhaar but also ensure through the offenders' biometric data that they never apply for it again, preventing their re-entry into the system," Mr Pandey claimed.