I thought I understood this based on a local case here a couple years ago, but your link shows differently. Tweet deleted. Thanks
According to this it can be authorized by a US Attorney or Assistant Attorney Gemeral.https://www.justice.gov/usam/usam-9-13000-obtaining-evidence#9-13.420 …
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It's US Attorney/AAG + you have to notify the head of the criminal division (who can veto it). Probably someone misstated it b/c they just knew it had to go to main justice to be approved & that's very unusual.
End of conversation
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