Taking note of concerns that former Judge CS Karnan has been misusing his caste status to threaten investigating officers probing cases filed against him, the Madras High Court has restrained the National Commission for Scheduled Castes and Scheduled Tribes (SC/ST) and the Tamil Nadu Human Rights Commission from taking cognizance of any complaint that may be made by Karnan (Bar Council of Tamil Nadu and Puducherry v The Registrar General and ors).