The Narcotics Control Bureau (NCB) is still trailing former CBI additional director U.N. Biswas in whose house an international drug racket was busted. The NCB has summoned him tomorrow for interrogation.‘‘He is not fully co-operating in the probe. For instance, two parcels in the name of those arrested came to his house from China through courier but he returned them. We would like to check with him regarding this and other things,’’ NCB assistant director, N.C. Patra said.The NCB today arrested L. Zauva, who is a temporary employee of the Mizoram House in Kolkata. It was Zauva who wrote the letter of introduction on the official letterhead of the Mizoram government for N. Thanga, the man who rented the flat. Meanwhile, Task Force officials of the State Drug Control Administration today raided the administrative office of the Krebs Biochemicals in Hyderabad and its two plants in Nellore and Vishakapatnam.
