A 20-YEAR sentence for one of the biggest cannabis hauls in the territory - nearly 400 kilograms - was upheld by a High Court judge yesterday. Mr Justice Power said the harsh sentence was justified considering the quantity of cannabis, found hidden in a Yuen Long village hut. The drug had an estimated street value of $17.49 million. The judge said he had no doubt convicted trafficker Chong Chak-on had a large crime operation behind him. The car parts dealer, 24, was arrested in July 1993, after police raided a stone hut in Tai Wai village. Chong appealed after claiming the judge had not properly instructed the jury and that 20 years was excessive. The original sentence, handed down last December, caused an uproar. But Mr Justice Pang said seizures of drugs had soared. The normal tariff, based on a 1986 case, recommends four years or more for amounts above nine kilograms.