Email is not a secure medium, and trying to pretend that it is is foolish.
Passing laws to restrict the ability of third parties from reading email makes as much sense as passing laws to keep the rest of the neighborhood from listening in while you the guy next door yell at each other from your respective back porches.
Email is a party line that anyone can listen in on. If you don’t want everyone to hear, encrypt it.
Invest in a secure certificate for your email, and you can encrypt your communications. I setup a basic email relay on some cheap home computer equipment and use a software certificate I purchased from Entrust for $20. In order to read my email, you have to have the proper hash key on the other end or be the certified recipient of the email. Since I don’t send much email, it doesn’t matter, but the peace of mind is worth it.
Purchase a TPM module for your existing computer or buy one with it already installed (pretty standard in newer stuff), and you can encrypt your thumb drives and local disks to prevent anyone from accessing it without a secure password.
I use multi-factor encryption/authentication for all of my stuff. If the FBI, CIA, or local law enforcement wanted to see what’s on my computers, they’d need my 31 character, 156 bit password or have a supercomputer powerful enough to crack 2048 bit encryption. Something tells me they won’t waste their time.
While you are correct in your cognizance of the electronic facts, there is a BIG difference between "third parties" and the police reading your communications for purposes of surveillance or arrest.
Your penance is to READ the Fourth Amendment twenty times. Here you go: