In 1998 , he was promoted as a " Chief Scientist ( CS ) " at PINSTECH . In May 1998 , when India tested its fission devices in Pokhran , the Pakistani government gave the scientists a green signal to test the nuclear weapon . On 28 May 1998 , Butt was among one of the scientists that witnessed at first hand the successful Chagai-I tests of six nuclear devices in Ras Koh Hills
tested
Pokhran-II
Noor Muhammad Butt