Expert Opinion on the Current State of U.S. Surveillance Law and Authorities
from Prof. Stephen I. Vladeck,
University of Texas School of Law
from 15 November 2021
https://www.datenschutzkonferenz-online.de/weitere_dokumente.html
in English
https://www.datenschutzkonferenz-online.de/media/weitere_dokumente/Vladek_Rechtsgutachten_DSK_en.pdf
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Also DLA Piper summary:
https://blogs.dlapiper.com/privacymatters/3606-2/