Court Cases Item Subject Kansas vs. Prairie Band of PotawatomiPDF Decision regarding fuel excise tax. Mark D. George vs. Commissioner of IRSPDF Decision regarding individual's claim of exemption from federal income tax liability. Alaska Chiropractic Society, et al v. United StatesPDF Decision regarding the excise tax on wagering for games conducted by permittees, not operators. United States Tax Court cases Search tool for United States Tax Court decisions