[davesque]

Does anyone know what sort of data they collect on people to identify them? One reason I ask is that I wonder how such a system could be used to provide a "scientific" answer as to what caste a person belongs. That would obviously be a little worrisome if it were possible.

[intended]

You have surname data, and also given address.

On top of it this data is often found floating around in many unguarded excel files all over the web.

Its trivially easy to break people into caste buckets.