At 36, Carlos Rodriguez is older than many of the other addicts. And he has had enough. He is going to call his mother, to ask her to help him get into drug rehabilitation.
Cristina Chevalier works with Madres de La Plaza, an NGO [non-governmental organisation) set up in 2006 to challenge the drug dealers selling pasta base and report them to police. She says they have become "a natural part of our landscape".