I hate to sound pessimistic, but it is incredibly naive to even think this is possible.
To which I reply:
Your voting record.
All the people you flirted (or more) with.
What you did in Vegas (every single visit).
The details of the activities you engage in when your parents/siblings/children/significant other aren't looking.
Your religious views.
Yes, the government knows a lot about all the above, thanks to the magic of big-data.
I hate to sound pessimistic, but it is incredibly naive to even think this is possible.