2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/48507Recently proposed Lorentz-PCT noninvariant modifications of electromagnetism are reviewed. Their experimental consequences are described, and it is argued that available data decisively rules out their occurrence in Nature.7 pages, 1 figure, using BoxedEPS macros and REVTeX; email to jackiw@mitlns.mit.eduHigh Energy Physics - PhenomenologyAstrophysicsHigh Energy Physics - Theorytext