  The recently derived consistency relations for Large Scale Structure do not
hold if the Equivalence Principle (EP) is violated. We show it explicitly in a
toy model with two fluids, one of which is coupled to a fifth force. We explore
the constraints that galaxy surveys can set on EP violation looking at the
squeezed limit of the 3-point function involving two populations of objects. We
find that one can explore EP violations of order 10^{-3} - 10^{-4} on
cosmological scales. Chameleon models are already very constrained by the
requirement of screening within the Solar System and only a very tiny region of
the parameter space can be explored with this method. We show that no violation
of the consistency relations is expected in Galileon models.

Cosmology and Nongalactic Astrophysics;General Relativity and Quantum Cosmology;High Energy Physics - Theory