Source: Tech – South China Morning PostThe US has been secretly tracking a group of Chinese users of the popular messaging service WhatsApp since November, possibly in an effort to halt illegal opioid sales, Forbes has reported.The US Drug Enforcement Administration (DEA) ordered WhatsApp, which is owned by Facebook, to track seven users based in China and Macau, a move authorised by the Pen Register Act, which allows such tracing without an explanation of the reasons for the monitoring, according to the report, which was posted…Read More