I boosted this story already, but a couple comments.
- It seems to have happened on January 25th, which was only five days after the new administration came in. This makes it hard to say whether this indicates a formal change in policy, an informal "taking off of the gloves", or a one-off mishap.
- A big question is why, if the agent was suspicious, this person was taken into custody and not simply refused entry.
- Borders are scary liminal spaces, legally speaking.