An opposition lawmaker whose son was shot dead last June is questioning why authorities have failed to arrest anyone in the case, even though police previously identified a suspect and issued a warrant for his arrest in December. “Until today, the authorities have not found any clues to arrest the offender,” said Yun Tharo, a Sam Rainsy Party parliamentarian in Banteay Meanchey province. “I want to find justice for my son.” Yun Thavrun, 25, was shot following a traffic dispute in the capital’s Daun Penh district in June. Phnom Penh Municipal Police Chief Touch Naruth declined to comment when contacted Thursday, saying he was too busy to discuss the case.