The lawmaker son of a leading Philippine politician has been remanded in custody in Hong Kong, accused of trafficking drugs. Ronald Singson (pictured), the son of Luis 'Chavit' Singson, governor of Ilocos Sur, was arrested in the arrival hall at Chek Lap Kok airport allegedly in possession of 26.1 grams of cocaine. Singson Jnr, who is also an Ilocos Sur congressman, is being held at the Lai Chi Kok Reception Centre. Governor Singson rose to prominence when he helped bring down his former best friend, Joseph Estrada, the then president of the Philippines, by testifying against him on illegal gambling pay-offs and corruption. Singson's political protege is world boxing champion and now congressman Manny Pacquiao. Reports in Manila say Ronald Singson, accompanied by two unidentified men, was allowed to bypass the X-ray machine and immigration booth at Manila's Ninoy Aquino International Airport when he left for Hong Kong. Justice Secretary Leila De Lima said: 'We will investigate [the alleged bypassing of the X-ray machine]. We're also having problems with those who bypass [these areas] for human trafficking. We are disturbed by this.' Ronald Singson has been charged with trafficking in a dangerous drug and could face a HK$500,000 fine and up to life imprisonment if convicted. He first appeared before a Hong Kong court on July 22. His next hearing is scheduled on August 19. It is understood he has not entered a plea. Foreign Undersecretary Esteban Conejos said consular officers in Hong Kong had visited Singson, who had rejected their offer to provide a lawyer because he had hired one himself. Conejos said the foreign office would monitor the case to ensure his rights were respected. Initially Governor Singson told Philippine media that he and his son were in Mongolia and that the offence could not have happened. On July 23, Philippine media had asked the detained lawmaker's business partner, actor Jomari Yllana, about the younger Singson's whereabouts. Yllana told the Philippine Daily Inquirer that he had spoken by telephone to the governor, who had told him that he and his son were in Mongolia and that Ronald would be 'on his way back to Manila and will make an official statement'. However, by that time Ronald Singson was already being held in detention. After reports from Hong Kong revealed Ronald Singson was in jail, Governor Singson, once deputy national security adviser to former Philippine president Gloria Arroyo, confirmed his son had been arrested. He said his son had been stopped at customs in Hong Kong while going to a concert in Macau by singer Usher, who had held a concert in Manila with the help of their firm, Fearless Productions. He also denied that Arroyo, now congresswoman for a district in her home province of Pampanga, north of Manila, had visited his son while in Hong Kong with her husband, Jose Miguel, who was having a medical check-up.