  We argue that quantum gravity theories should involve constructing a quantum
theory on non-Cauchy hypersurfaces and suggest that the hypersurface direction
should be the same as the direction of the effective non-gravitational force
field at a point. We start with a short review of works which support this idea
and then we foliate spacetime along an effective non-gravitational force field
direction. Next we discuss the implication of this foliation on the expected
properties of quantum gravity. We also discuss the vagueness caused by
constructing any quantum theory when using non-Cauchy foliation.
