  The existence of non-vanishing Bohm potentials, in the Madelung-Bohm version
of the Schr\"odinger equation, allows for the construction of particular
solutions for states of quantum particles interacting with non-trivial external
potentials that propagate as free classical particles. Such solutions are
constructed with phases which satisfy the classical Hamilton-Jacobi for free
particles and whose probability densities propagate with constant velocity, as
free classical particles do.
