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I bet you could buy one with cash on Craigslist pretty easily though

You're right. I retract my comment; it was fundamentally mistaken.

> it can be tracked retroactively on virtually every street, every highway, etc.

Not virtually. Actually.

NSA et al can do - will they publicly tip that hand for this?

> Not virtually. Actually.

"virtually" also means "almost", which is what GP was using it for.

No need to publicly tip your hand. Just follow that trail of evidence, then use parallel construction to produce a different trail that you reveal publicly.