Section 142(d) in The Drugs and Cosmetics Rules, 1945
(d)The licensee shall allow any [Inspector appointed under the Act] [Substituted by G.S.R. 444, dated 31.3.1973 (w.e.f. 28.4.1973).] to enter with or without prior notice any premises where the manufacture of a substance in respect of which the license is issued is carried on, to inspect the premises and to take samples of the manufactured products under a receipt.