Hundreds of people have been detained by the Thai military since martial law was imposed three months ago.
The army says it invoked the measure to restore peace and order following months of anti-government protests.
The military insists all prisoners are being treated in line with human rights laws, but rights groups say detainees are being subjected to interrogations without legal advice.
Al Jazeera's Veronica Pedrosa reports from Bangkok.
Source: Al Jazeera