The special investigation team (SIT) of Kerala police on Saturday (March 16) gave a clean chit to former Odisha DGP B B Mohanty in the impersonation and forgery cases against his rape convict son Bitihotra Mohanty. "We could not get any evidence against B B Mohanty. He has no role to play in impersonation and forgery cases against his son Bitti," said Kerala Police Team leader Josi Joesph after questioning the retired IPS officer for about four hours.