tighten up the ration card issuance procedure. Add biometrics to the ration card. The solution is not to have a country-wide, all-encompassing ID system.
Binand
PDS is only one of the IDs, every ID has this problem. For example, Driving License. At the moment, its futile to confiscate someone's License since that person can go to a different RTO and get a License made there.
Similarly, one person can get multiple PAN cards and manipulate IPOs.
A centralized biometric system can solve some of these issues.
It does not matter if that system if aadhar or something else, but need that soon.
-Shamit