The CBI has told the Supreme Court that the prosecution of Uttar Pradesh Chief Minister Mayawati in a disproportionate assets case cannot be dropped as it has found cogent, credible and admissible evidence against her.Mayawati contended that the probe agency should drop the proceedings against her in the wake of the Commissioner Income Tax (CIT appeal) order of April 5 and 19, 2010 giving her a clean chit. But, in an affidavit filed in the apex court, the CBI submitted that the order has been challenged before the Income Tax Appellate Tribunal.CBI also contested the claim of the UP Chief Minister questioning its jurisdiction in proceeding against her by referring to the investigation into the Taj Corridor case in which she was absolved by the agency of misappropriating 17 crore rupees disbursed for the project.The agency said, the DA case against Mayawati is distinctly separate from the Taj Corridor case which has no bearing in the present case.The affidavit said that the investigation conducted by CBI is different from the proceedings of the I-T department as criminal probe by the agency is based on evidence admissible in court of law.