I don't think that's the analog. Nor is checking ID at a pub. The analog would be that any time two people speak to each other on the street or in a cafe, they should first present their ID to a surveillance camera and stand within earshot of a microphone.

[edit] The social argument for banning or restricting substances is also limited when it comes into too great a conflict with the social argument for tolerating individual choice. To even put the freedom to speak privately on the same plane as the freedom to take drugs is to abandon reason itself, not to mention hundreds of years of hard-won liberties and enlightenment. Anti-drug regimes are merely authoritarian. Anti-privacy regimes are totalitarian. There is a world of difference between policing action and policing thought.