I wonder how many of the people in the system the MTA&#x2F;NYPD can identify in real time and with what precision it can locate them. I presume they know the identities of a large proportion through entrance swipes from credit&#x2F;debit-purchased metrocards, but that still leaves the problem of determining when someone has exited and where they in the meantime.<p>Between the travel data they&#x27;re storing on the metrocards (exhibit number one, the Ebola doctor) and the ubiquitous cameras, I think the WiFi has more to do with tracking the public than improving service.