The Ninth Circuit has determined that a petitioner who held temporary resident status, and who stopped at a Customs and Border Patrol checkpoint and subsequently released after showing his temporary resident card, was not admitted to the United States by virtue of this encounter. Admission, instead, requires presentation at a port of entry followed by entry with government consent. The court did clarify that “noncitizens factually admitted to the United States at a U.S. port of entry while they hold temporary resident status under § 1255a(a) do not magically become unadmitted once their temporary resident status ends.”
The full text of Posos Sanchez v. Garland can be found here:
https://cdn.ca9.uscourts.gov/datastore/opinions/2021/07/07/17-72002.pdf