THE SAUCE:

https://www.cadc.uscourts.gov/internet/opinions.nsf/79798A0FA0633B7985258591004DD3E7/$file/20-5143-1848728.pdf

[This case is about] whether, after the government has explained why a prosecution is no longer in the public interest, the district judge may prolong the prosecution by appointing an amicus, encouraging public participation, and probing the government’s motives. On that, both the Constitution and cases are clear: he may not. For the foregoing reasons, we grant Flynn’s petition for a writ of mandamus in part and direct the district court to grant the government’s Rule 48(a) motion to dismiss. In light of that grant, we vacate the district court’s order appointing an amicus as moot. . . . So ordered.