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.