Thanh Hoa, May 15 -- Police in Vietnam's central province of Thanh Hoa, in coordination with police in Laos' Houaphanh province, have dismantled two cross-border drug trafficking cases, arresting four suspects and seizing more than 23kg of narcotics and precursor substances. The Thanh Hoa provincial Department of Public Security said on May 14 that the operation was carried out following an extended investigation under bilateral cooperation mechanisms in combating transnational drug crimes. The seized included more than 26,000 synthetic drug pills, 2.5 bricks of heroin, 3.1kg of synthetic narcotics in liquid form known as "happy water," 4.5kg of kratom leaves containing narcotic substances, and 12kg of precursor chemicals used in heroin p...