26 December 2014
Last updated at 06:37
Win Zaw Htun (L) and Zaw Lin were arrested in early October
The trial is underway of two Burmese men charged with the murder of two British tourists earlier this year in Thailand.
Zaw Lin and Win Zaw Htun, both 21, are accused of killing Hannah Witheridge and David Miller on the island of Koh Tao in September.
In October the two men retracted confessions initially made to police. They deny killing the tourists.
The suspects, both migrant workers, could be executed if found guilty.
The trial was due to begin in February but was unexpectedly brought forward, the BBC’s correspondent in Bangkok, Jonathan Head, says.
The investigation has been marred by allegations of both police incompetence and of confessions extracted by torture, he says.
The bodies of Hannah Witheridge and David Miller were found on a Thai beach on 15 September