has authority for the Phnom Bak centre in Sisophon town, Banteay Meanchey province, and manages a drug detention centre with the military on a military base in Koh Kong town, Koh Kong province. There are "a further six drug detention centers" in Cambodia "that each year hold at least 2,000 people without due process". Events of 2013. Amnesty International and the Cambodian Center for Human Rights, located in Cambodia, also raised 'impunity' as a concern. "Impunity for perpetrators of human rights abuses and lack of an independent judiciary remained serious problems," Amnesty's 2012 Annual Report said. Since June, NGOs reported that authorities "abused at least 30 prisoners – 29 while in police custody and one in prison. Kicking, punching and pistol whipping were the most common methods of reported physical abuse, but electric shock, suffocation, caning and whipping with wires were also used." The US State Department report says "politicized and ineffective judiciary is one of the country's key human rights abuses." That report says "the government generally does not respect judicial independence, and that there has been widespread corruption among judges, prosecutors and court officials." "Human Rights Watch documented how guards and staff at informal detention centers "whip detainees with rubber water hoses, beat them with bamboo sticks or palm fronds, shock them with electric batons, sexually abuse them, and punish them with physical exercises intended to cause intense physical pain." Informal detainees held in extra judicial centres have been forced to work on construction sites, including in at least one instance to help build a hotel. There are documented cases in Cambodia of people committing murder and then paying state officials so as not to be prosecuted. "Impunity enjoyed by the rich and powerful helps explain a lack of public trust in Cambodia's judicial and law enforcement institutions." One type of slavery present in Cambodia is when parents sell the virginity of the daughters, often to pay off a debt. Even after their daughter is no longer a virgin, parents may continue to sell their daughters into sex slavery. According to ABC News, it was during a brutal and lawless period, following the fall of the Khmer Rouge, that child sex slavery began to flourish. Other slaves in Cambodia are forced to make bricks. On 14 March 2018, the UN expert on the human rights situation in Cambodia Professor Rhona Smith of United Kingdom, "expressed serious concerns about