“I can’t see much, if any, of this ‘evidence’ getting through the courts’ ‘expectation of privacy’ doctrine.”
I can. They contact the FBI or cops, and the cops find another way to “discover” the evidence. Think in terms of driving some dope and they know you are from snooping. They call the Highway Patrol who stops you for going 73 in a 70 zone. Then his dog farts and that means it senses drugs. He searches your car and “finds” the dope.
You’ll have no clue the NSA intercepted your text message or read your email. Stasi...
I expect these rules to just allow some- legally actionable- info collected overseas to be accessed by domestic police.
Which wouldn’t fit your scenario.
We’ll see.
And, of course, the ‘slippery slope’ factor will have to be considered.