A 16-year-old girl was jailed for six years and seven months yesterday, after pleading guilty to trafficking 590 grams of ketamine disguised as packages of tea. Chow Yuen-toa, who left school after Form Three and worked as a waitress and saleswoman, pleaded guilty to one count of drug trafficking in the Court of First Instance. The former student of Maryknoll Fathers' School in Sham Shui Po was caught after a police officer saw her acting furtively at Yau Lai Estate in Yau Tong on June 26. The officer searched Chow's handbag and found three foil-wrapped packages labelled "Choice Tea Leaves", acting senior public prosecutor Bobby Cheung Man-kwan told the court. The substance in the packages was found to contain 590 grams of ketamine, with an estimated value of HK$85,100. The teenager had been promised HK$300 for collecting the ketamine in Tai Po and delivering it to someone called "Ah San" in Yau Tong, the court heard. Chow, who is two months shy of turning 17, was jailed after her plea and sentencing hearing.