  We discuss the impact of non-standard neutrino matter interactions (NSI) in
propagation on the determination of CP phase in the context of the long
baseline accelerator experiments such as Deep Underground Neutrino Experiment
(DUNE). DUNE will mainly address the issue of CP violation in the leptonic
sector. Here we study the role of NSI and its impact on the question of
observing the CP violation signal at DUNE. We consider two scenarios of
oscillation with three active neutrinos in absence and presence of NSI. We
elucidate the importance of ruling out subdominant new physics effects
introduced by NSI in inferring CP violation signal at DUNE by considering NSI
terms collectively as well as by exploiting the non-trivial interplay of moduli
and phases of the NSI terms. We demonstrate the existence of NSI-SI
degeneracies which need to be eliminated in reliable manner in order to make
conclusive statements about the CP phase.
