JUBA, South Sudan — South Sudan's chief justice says the world's newest country will start using mobile courts to deal with a backlog of cases in its justice system.

Chief Justice Chan Reech said he has seen suspects languishing in prison for three years without facing formal charges. He said earlier this week that police often fail to fully investigate reported crimes.

Human Rights Watch said in a June report that people in South Sudan were often detained arbitrarily, often not charged with crimes or provided with lawyers. Human Rights Watch documented cases where prisoners were detained up to five years without trial.

Reech blamed the problem on a lack of judges and a weak judicial infrastructure.