Myanmar migrant workers Zaw Lin (R) and Win Zaw Htun arrive at the Koh Samui Provincial Court, in Koh Samui, Thailand, July 22, 2015. Defence lawyers in the trial of two Myanmar men accused of killing two British backpackers on a Thai resort island last year said on Wednesday they would focus on the reliability of crucial DNA evidence. British tourists Hannah Witheridge, 23, and David Miller, 24, were killed last September. Their bodies were found on a beach on Koh Tao, a Thai island in the Andaman Sea popular with backpackers and divers. REUTERS/Chaiwat Subprasom