[estearum]

The reason cell tower data is excluded from Third Party Doctrine has nothing to do with the contents of a cell phone. Cell tower data doesn't have any relationship whatsoever to the contents of the phone.

The relevant factors are:

1. It creates a near-complete picture of a person's whereabouts

2. It is effectively not optional to have and carry a cell phone today

You do in fact have a reasonable expectation that the government can't reconstruct a near-perfect timeline of your daily life without a warrant... obviously.

[stickfigure]

A cellphone is effectively you in the eyes of the law.

Any automobile may be driven by many people. Only 30% of households are single-person households.

We'll see how this plays out in courts. I'll bet the license plate readers survive. More skeptical about facial recognition though.

[estearum]

> A cellphone is effectively you in the eyes of the law.

No. I just laid out the reasons why cell tower data is different. It has nothing to do with whether a cellphone "is effectively you," which obviously it's not.