  By assuming a deterministic evolution of quantum systems and taking realism
into account, we carefully build a hidden variable theory for Quantum Mechanics
based on the notion of ontological states proposed by 't Hooft. We view these
ontological states as the ones embedded with realism and compare them to the
(usual) quantum states that represent superpositions, viewing the latter as
mere information of the system they describe. Such a deterministic model puts
forward conditions for the applicability of Bell's inequality: the usual
inequality cannot be applied to the usual experiments. We build a Bell-like
inequality that can be applied to the EPR scenario and show that this
inequality is always satisfied by Quantum Mechanics. In this way we show that
Quantum Mechanics can indeed have a local interpretation, and thus meet with
the causal structure imposed by the Theory of Special Relativity in a
satisfying way.
