A Thai mother has been arrested for hiring a gunman to murder her drug-addicted son despite a plea she did it out of 'love'. Supatra Chompoosri, 48, is being held in police custody in the northern city of Chiang Rai on murder charges after a confession that has gripped a nation currently battling a worsening amphetamine scourge. The divorcee told police she had showered love on Sithipol Netsuwan - her only son - but had watched him turn into a volatile 'monster' as he fell deeper into dependence on speed pills. She sent him to a private police training academy but the 28-year-old was eventually dismissed from his first post after being implicated in the theft of 80,000 pills seized from a major trafficker. Fearing the safety of her family - including Sithipol's wife and child - were at risk, she told police she paid a gunman 45,000 baht (HK$9,675) to shoot her son on December 30, the Thai press reported yesterday. 'I did this out of love for my son and my concern for society,' she said. 'I wanted the world to keep in mind that drugs are very dangerous.' The gunman, Somsak Khamkaew, is also in custody. Thai authorities fear amphetamines and methamphetamines are rapidly replacing heroin as the country's biggest drug problem. Millions of tablets are believed to have been smuggled in last year from factories hidden in the jungles of Laos and Burma as dealers targeted children and teenagers to forge new markets.