Chemical maker halts Mexican sales of chemical used to produce heroin

US chemical company Avantor has stopped selling acetic anhydride in Mexico following a Bloomberg report on the chemical’s use in converting opium to heroin. Avantor’s acetic anhydride has been found at illegal drug lab busts since 2010 and is readily available in Mexico where there are few effective regulations for monitoring unusual purchases or reporting missing stock. The US Drug Enforcement Agency (DEA) says that Mexico is the primary source for heroin imported to the US.