Metro Manila (CNN Philippines) — It appears that President Rodrigo Duterte's move to publicly name officials allegedly linked to the drug trade wasn't enough to scare off the others in the same business.

So he has a new incentive for informants, to boost his anti-drug campaign — a ₱2M reward for the head of those he calls 'ninja' police.

According to the President, "ninja" cops are those who re-sell illegal drugs seized in police operations and protect drugs syndicates while still active in service.

"I might be inclined to place a reward on their head, the members of the ninja or the members of the police who are protecting the drug syndicates in this country. I am placing per head ₱2-million," Duterte said.

"I want the Police and the Armed Forces to destroy the drug apparatus in this country."

Philippine National Police (PNP) Chief Ronald Dela Rosa said they know who these "ninja cops" are - and admits there are still a lot of them.

"You can just imagine. Pulis ka… ikaw ang magbenta? Ano ang dapat gawin sayo," Dela Rosa said. [You can just imagine. You're the police, and yet you sell drugs? What should be done to you?]

Also read: 'Knock and plead' — On night patrol with Philippines police

Even as he continues to be criticized for alleged human rights violations in his anti-drug drive, President Duterte said there will be no let up.

He said he will be as harsh as ever.

"Do not give me that — that just because he is poor, he has to earn, he has to sell shabu. That act does not really matter."

When he was still mayor of Davao City, Duterte would often warn his constituents involved in drugs to get out of his city — or get killed.

The President said there is a possibility the same could happen on a national scale.

"I have not reached that point. But maybe. If you're persistent and if you still find drugs a viable economic livelihood. There's always something, a draw back in this planet," Duterte said.

The President also stressed, there's no stopping him — not even threats that he might end up in prison.

"Prison? I will go to prison. I will not even ask for a special room," Duterte said.

Alongside his fight against drugs is his campaign against corruption.

He told corrupt policemen, judges and prosecutors, there will be a day of reckoning.

CNN Philippines' Ina Andolong contributed to this report.

Also read: De Lima, officials in Duterte drug matrix may face graft charges