Found this, The Hydrogen atom in Bohmian Quantum Theory[+]
If the Bohmian interpretation of quantum mechanics is considered in
the case of the hydrogen atom, it leads to a prediction that "normal"
quantum mechanics does not make. That is the existence of a distance of
closest approach of the electron to the proton. This distance of two
hundred fermi is of the order of the Planck length, a region where the
"normal" laws of physics are thought to break down. If the probability
density of finding an electron inside this region could be experimentally
measured, that would thus be a definite test to differentiate between the
two interpretations of quantum mechanics.