A serial drink spiker who doped five van drivers by lacing their cola drinks with a potent tranquilliser was yesterday jailed for eight years. Deputy Judge Pang Kin-kee told Tso Kam-on, 24, he had shown a blatant disregard for human life. Two of Tso's victims crashed their vehicles after falling into a stupor. A third spent four days in hospital recovering from the effects of the drug. Tso, who could have faced a life sentence, is the second drink spiker to come to court in nine months. Last December prison officer Kwok Yuk-ho, 37, was jailed for 14 years for injecting drugs into 10 soft drink cartons in 7-Eleven and Circle K stores. He shadowed his victims out of the shop, waited until they keeled over and stole their wallets. Tso, who netted $61,000 in the five-day spree, admitted five charges of administering drugs with intent to steal between January 2 and January 7 this year. Prosecutor Agnes Chan Wing-han told the High Court Tso approached the drivers in Kowloon on the pretext he wanted to hire them to deliver goods. He then offered them a drink laced with a liberal dose of the tranquilliser Halcion and when they passed out he stole their valuables. Tso conned his first victim, Ip Kit-ling, in Shek Kip Mei Street. Mr Ip remembered nothing until he woke up in hospital, Ms Chan said. 'A police officer discovered Mr Ip in the vehicle, which had been driven erratically and crashed,' she said. His second target, Fan Sheung-wai, blacked out for 24 hours after he was offered a cup of spiked cola. Mr Fan was taken to hospital after returning home in a semi-comatose state. His van crashed near Willow Street, Mongkok. Defence counsel John Mullick said: 'It was extraordinary behaviour. It was a desperate attempt to get money. 'He had arranged to get married and his girlfriend was pregnant.' All the drivers will be reimbursed following a whip-round by Tso's family.