Section 85 of The Indian Evidence Act, 1872
85. Presumption as to powers-of-attorney.—The Court shall presume that every document purporting to be a power-of-attorney, and to have been executed before, and authenticated by, a Notary Public, or any Court, Judge, Magistrate, 1[Indian] Consul or Vice-Consul, or representative 2[***] of the 3[Central Government], was so executed and authenticated.