Article 57 of Code of Civil Procedure

Everything stated by the agent at the hearing in the presence of his principal shall be equivalent to a statement by the principal himself, unless he denies it during the hearing of the case at that same session. If the principal does not attend, no admission of the right claimed, waiver thereof, settlement or arbitration thereof, acceptance, tendering or referral back of an oath, abandonment of the proceedings, waiver of the judgment in whole or in part or of a means of challenging it, release of an attachment, relinquishment of securities while the debt remains, allegation of forgery, recusal of a judge or expert, formal tender or acceptance thereof, or any other act for which the law requires special authorization shall be valid without special authorization.