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> TSA used that Subpeona as part of the detainment criteria

TSA has no authority to detain anyone. You can literally walk away.

The article is unclear but it’s safe to assume he was detained by immigration.

I read a different article that reported he was returning to the U.S. from Japan. So definitely it was immigration authorities.

That is incorrect. TSA absolutely has full legal authority in the federal area of an airport including detainment and arrest. They are federal agents and past the security gates is federal area.

Immigration also has detainment authority. According to BleepingComputer it was actually CBP (Border Patrol, not ICE).

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