KUNMING, April 28 (Xinhua) -- Police in southwest China's Yunnan Province busted two drug trafficking cases on April 18 and 21 respectively, seizing a total of 36.93 kg of methamphetamine, local authorities said Sunday.

After learning that a man plans to transport a batch of drugs from Lancang Lahu Autonomous County to Kunming, capital of Yunnan, by way of the Simao District of Pu'er City, police launched an investigation.

Around 4 a.m. on April 18, police intercepted a car near a toll station and found 16.95 kg of methamphetamine. The suspect has been put under criminal detention.

On April 21, police of the Mojiang Hani Autonomous County found 19.98 kg of methamphetamine in a car during a road check. The suspect was arrested. The case is still being investigated.

In the first quarter of the year, police in Pu'er busted 145 drug cases with 141 suspects arrested and 1.25 tonnes of drugs captured, the most in the province.

Drug trafficking is a challenging problem in Yunnan, as it borders the Golden Triangle known for drug production and trafficking.