2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/170842By employing the Stueckelberg formalism, we argue that the theory of massive spin-2 field coupled to electromagnetism in flat space must have an intrinsic, model independent, finite UV cutoff. We show how the very existence of a cutoff has connection to other pathologies of the system, such as superluminal propagation. We comment on the generalization of the results to arbitrary spin, and to gravitational interaction.4 pages, minor changes made in format and text, to appear in the proceedings for ICHEP08High Energy Physics - Theorytext