The coronavirus pandemic is driving up the price of heroin, methamphetamine, and fentanyl as Mexican cartels scramble to get their hands on Chinese-manufactured chemicals now in short supply. “The cartels are having a lot of difficulties producing drugs right now, and when the supply is low the price always goes up,” a US federal law enforcement source told the Post. “China has pretty much-stopped production on the chemicals they need to do business.” The pandemic has led to a shortage of workers at labs in China which produces more than 80 per...