2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/34504In this communication I analyze the problem of complete exceptionality of wave propagation in a class of spin 2 field theories. I show that, under the imposition of the good weak-field limit, only two Lagrangians are completely exceptional. These are the linear Fierz Lagrangian, and a Born-Infeld-like Lagrangian. As a byproduct, I reobtain the result that in a nonlinear theory, spin 2 particles follow an effective metric that depends on the nonlinearities of the Lagrangian.8 pages, RevTex4, contribution to the Festschrift in honor of Professor Mario Novello's 60th birthdayGeneral Relativity and Quantum Cosmologytext