2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/96199't Hooft's derivation of quantum from classical physics is analyzed by means of the classical path integral of Gozzi et al.. It is shown how the key element of this procedure - the loss of information constraint - can be implemented by means of Faddeev-Jackiw's treatment of constrained systems. It is argued that the emergent quantum systems are identical with systems obtained in [Phys.Rev. A 71 (2005) 052507] through Dirac-Bergmann's analysis. We illustrate our approach with two simple examples - free particle and linear harmonic oscillator. Potential Liouville anomalies are shown to be absent.11 pages, RevTeX, revised version with minor changes, accepted to Annals of PhysicsQuantum PhysicsHigh Energy Physics - TheoryMathematical Physicstext