  An intriguing opposite sign of the CP violating asymmetry was recently
measured in the tau decay modes tau -> Ks pi nutau by the BaBar collaboration,
than that expected within the Standard Model. If this result is confirmed with
higher precision, the observed decay rate asymmetry ACP, can only arise from
some Non-Standard Interactions(NSI) occurring possibly in both the hadronic as
well as in the leptonic sectors. We illustrate that while a simple charged
scalar interaction cannot yield this rate asymmetry, it will be possible to
generate this in the presence of a tensor interaction. Parameterizing the
strength and weak phase of this NSI contribution, the observed branching ratio
and the decay rate CP asymmetry for the particular mode tau -> Ks pi nutau, are
used to determine the CP violating weak phase and the coupling of a tensorial
interaction that can give a consistent sign and magnitude of the asymmetry.
