http://channel.nationalgeographic.com/series/inside/3144/Photos#tab-Photos/5
The prison operates on a simple informal agreement between the prison authorities and the prisoners: the prisoners are not allowed to leave the closely watched precincts, but when inside the prison walls they can do whatever they like. In this way the prison authorities do not have to bother about the prison's organisation. Inside, about 20 unarmed warders oversee the prisoners. The prisoners take care of everything--law and order, cleaning, food, education, but they cannot control the numbers of inmates as the authorities continue, despite the overcrowding, to admit prisoners. Currently, there are about 6000 prisoners in Lurigancho.
Everything is for sale
The prisoners can only survive by providing for themselves, which means they need help from their families for money to buy essentials and food. A strict hierarchy operates within Lurigancho. Those prisoners without money have to work for the wealthier inmates. This ranges from washing clothes to sexual services. Most things are available in Lurigancho, and they either enter the prison overfly or are smuggled in by visiting relatives. For a small fee the warders willingly turn a blind eye, but for more money they will bring things in themselves. "Look, 100 g of cocaine can be smuggled in, which is mostly done by women who hide the cocaine in their vagina," a prisoner says. "But a whole kilo cannot be brought along that way and must have been smuggled in by the warders themselves."