Maharashtra Police Act 1951
Section 164 :
Consent, etc., of a competent authority may be proved by writing under his signature :
Whenever under this Act, the doing or the omitting to do anything or the validity of anything depends upon the consent, approval, declaration, opinion or satisfaction of a competent authority, a written document signed by a competent authority purporting to convey or set forth such consent, approval, declaration, opinion or satisfaction shall be sufficient evidence thereof.