rginia from exempting from state taxation the retirement benefits of certain former state law-enforcement officers, without providing the same exemption for the retirement benefits of former employees of the United States Marshals Service.Republic of Sudan v. Harrison, No. 16-1094: Whether the Second Circuit erred by holding—in direct conflict with the D.C., Fifth, and Seventh Circuits and in the face of an amicus brief from the United States—that plaintiffs suing a foreign state under the Foreign Sovereign Immunities Act may serve the foreign state under 28 U.S.C §1608(a)(3) by mail addressed and dispatched to the head of the foreign state’s ministry of foreign affairs “via” or in “care of” the foreign state’s diplomatic mission in the United States, despite U.S. obligations under the Vienna Convention on Diplomatic Relations to preserve mission inviolability.Bistek v. Berryhill, No. 17-1183: Whether a vocational expert’s testimony can constitute substantial evidence of “other work,” 20 C.F.R. §404.1520(a)(4)(v), available to an applicant for social security benefits on the basis of a disability, when the expert fails upon the applicant’s request to provide the underlying data on which that testimony is premised.