AMRITSAR: Amidst the ongoing drive to make Punjab a safe and secure state as per directions of Chief Minister Bhagwant Singh Mann, Counter Intelligence (CI) Amritsar has busted a drug supply module linked to foreign-based smuggles with the arrest of four operatives and recovered 4 Kg Heroin, ₹3.90 lakh drug money and one .32 bore pistol along with magazine and five live cartridges from their possession, said Director General of Police (DGP) Punjab Gaurav Yadav here on Sunday.