Today in Supreme Court History: December 9

MacMath v. United States, 248 U.S. 151 (decided December 9, 1918): clerk employed as “acting U.S. weigher” at collection port not entitled to $2,500 statutory salary assigned to weighers (collection ports were notoriously a gold mine of booty, but I suppose not for lowly weighers, “acting” or otherwise)

Warger v. Shauers, 574 U.S. 40 (decided December 9, 2014): enforcing Fed. R. Evid. 606(b): juror cannot testify, and court cannot receive affidavit, as to statements during deliberations (here, as to bias) (exceptions: jury considered extraneous prejudicial information; was subjected to outside influence; or foreman made a mistake on the verdict form)

Virginia v. Maryland, 540 U.S. 56 (decided December 9, 2003): What to do about the Potomac River?  Charles I, as a favor to his friend Lord Baltimore, had set the Maryland border on the Virginia side of the river, instead of in the middle or along the thalweg; this decision overruled Charles and said Maryland couldn’t interfere with Virginia’s use of the river, in particular drawing water from it for drinking.  (The Mount Vernon Conference of 1785, a precursor to the Constitutional Convention, had already made the same decision, but it no longer had legal force.)