"Now we sit in the same room and talk directly with each other," he said.

According to the ministry, the campaign could be the start of regular cooperation among the four countries.

Boumphong Inthavong, an officer from Laos, said he hopes it is, explaining that he has gained invaluable experience in his month at the center.

"I used to have to send information involving China to our narcotics bureau first, then communicate with China through our foreign affairs departments," he said.

Taspong Wattanayagorn, from Thailand's Office of the Narcotics Control Board, agreed and said the cooperation has proved the most effective way of fighting drugs in his 18-year career.

"The information exchanges save time," he said. "We talk face to face instead of handing documents between governments, which is better."

His job at the center is to collect clues and relate feedback from the Thai government.

"Language is not a big problem, as we have good translators. I'm also trying to learn Chinese," Wattanayagorn said, showing his determination to make the campaign a long-term effort.

"Thailand will do an evaluation of the cooperation after the campaign ends. If we feel it has been effective in fighting drug trafficking, we'll push on," he said.

Chinese officer Lan agreed and said making the campaign regular needs the backing of all four countries, as well as detailed plans and funding.

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