(a)Condition of classification. As a condition of classification and continued stay in classification pursuant to section 101(a)(15)(S) of the Act, nonimmigrants in S classification must have executed Form I-854, Part B, Inter-agency Alien Witness and Informant Record, certifying that they have knowingly waived their right to a removal hearing and right to contest, other than on the basis of an application for withholding of deportation or removal, any removal action, including detention pending