The nso group is on the entity list, so no western govt is using it. And it was never used to gain access to devices that they already had physical control over.
It means that if all the other evidence shows that the desired evidence is on the computer, then it is not a question of whether it exists, so youre not really searching for something. Youre retrieving it. That doesn't implicate the 4th amendment.
Unlocking/forced unlocking is not a 4th amendment issue, but a 5th amendment one.
The 4th amendment would protect you from them seizing your phone in the first place for no good reason, but would not protect you from them seizing your phone if they believe it has evidence of a crime.
Regardless, it is not the thing that protects you (or doesn't, depending) from having to give or otherwise type in your passcode/pin/fingerprint/etc.
You shouldn't assume that someone with the disk password is entitled to the user's data. That's kinda a fundamental separation. Your home directory should be encrypted separately from the disk anyway
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