CBP does end run around warrants, simply buys license plate-reader data
How does "unreasonable search" work when any agency can buy data from anywhere?
Is the surveillance happening in your neck-of-the-woods ?
I don't think being able to buy data thwarts the 4th. I would say that any data not in the public domain or data that is public but can be proven to have been gotten from non-public sources falls under 4th amendment protection.