One article had an account of someone abducted, searched, and released, and then the authorities said they did not have records of arresting him. If there's no records, it's not the regular court system, even if it happened in the court building.
It's not clear to me what other records they would have in that case and again, this isn't exactly being "disappeared" given that they were turned over to the police for processing and then released without charges. Sounds more to me like some cops were lazy with the paperwork when they were going to release them anyhow.
The feds have wide-ranging authority to arrest people and always have, though:
https://www.lawfareblog.com/what-heck-are-federal-law-enforc...
If that happened to someone you were walking with and they left you there, wouldn't you call police and report that your friend was abducted?
Also, the government officials have claimed the people weren't arrested, and my understanding (which could easily be wrong) is being detained by law enforcement means you're not permitted to leave, not that you must go with them, so I'm out of words.
http://opb-imgserve-production.s3-website-us-west-2.amazonaw...
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It appears that the State has largely backed away from any argument that the federal agents were not at all identifiable as law enforcement. Mr. Pettibone acknowledges that their uniforms said “Police,” Pettibone Decl. [1-1] ¶ 3, and the video shows agents wearing clothing clearly marked as “Police.”
Congress...chooses not to enforce it? You're talking about Congress, commonly known as the executive branch of the triune government, which enforces the laws?
It's at times like these I'm reminded of the saying...that fog is a sign of merging timelines.
The answer is that the Constitution give Congress abilities like impeachment specifically to give them the ability to apply pressure and "enforce" that the executive branch does what it is entrusted to do.
The exact same situation applies to police. Surely you understand that it is possible for police officers to break the law even though they are technically also the people responsible for enforcing it?
See this: https://www.wdrb.com/us-capitol-in-fog/image_571cd9fc-ca8b-1...
What you're looking at is the probability of the US Capitol being in a particular place. It's a common misconception that fog makes things look blurry, but you're seeing the effect of the average probability of it being there at all, given the many possibilities in alternate time tracks. It is blurry. Never mind what might be going on inside.
People who wander into fog often come out into a different world, but generally their memories adjust...not always though.
As for Portland, that appears to be an unusual use of Federal authority, but as far as I can tell, they actually do have relatively sweeping legal authority, even if it's not often exercised (see the lawfare blog for some analysis thereof) and everyone is being processed in the regular court system. So it's not exactly the case of being "disappeared" that some reports claimed.