2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/132130We established a physically utilizable Bell inequality based on the Peres-Horodecki criterion. The new quadratic probabilistic Bell inequality naturally provides us a necessary and sufficient way to test all entangled two-qubit or qubit-qutrit states including the Werner states and the maximally entangled mixed states.4 pages, 2 figures. Revised version. Title and Figures changed, references addedQuantum Physicstext