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"Black money used to have a major adverse impact on society. Narcotics trade is very big and its marketing takes place from Afghanistan and through other ports and the whole trade happens in black money.
"That narcotics trade, which destroys the youth of the world and the country, had a big impact. The money there (narcotics trade) would go to terrorists and Maoists. We have proof. Now there is a stop on all those," he told reporters here.
He said peace has returned in Kashmir while many Naxal supporters and their families have surrendered to police in Odisha.
Ahir, who attended the three-day annual conference of DGPs and IGPs at the National Police Academy here, said the event discussed ways to tackle crime and improving policing.
"This programme has been going on for many years. It is the good luck of Hyderabad that such a training academy for IPS is in Hyderabad and Telangana. Prime Minister (Narendra Modi) was here.
About the conference, he said, "New suggestions come, the introduction of digital police stations, e-challans (traffic), CCTV cameras be used extensively... All these things happen. It is routine."
"It is the first time that the Prime Minister and Home Minister Rajnath Singh are spending so much time," he added.