 However, the form above has two advantages: First, it makes sense for particles with spin—and, in fact, Bohmian mechanics without further ado accounts for all the apparently paradoxical quantum phenomena associated with spin. Secondly, and this is crucial to the fact that Bohmian mechanics is empirically equivalent to orthodox quantum theory, the right hand side of the guiding equation is \(J/\varrho\), the ratio of the quantum probability current to the quantum probability density. This shows that it should require no imagination whatsoever to guess the guiding equation from Schrödinger’s equation, provided one is looking for one, since the classical formula for current is density times velocity. Moreover, it follows from the quantum continuity equation \(\partial \varrho /\partial t + \textrm{div} J = 0\), an immediate consequence of Schrödinger’s equation, that if at some time (say the initial time) the configuration \(Q\) of our system is random, with distribution given by \(\lvert \psi \rvert^2 = \psi *\psi\), this will always be true (provided the system does not interact with its environment).