On 3 April [2002] Maria de los Angeles Veron, known as Marita", went missing. In February [2012], 13 people accused of kidnapping Ms Veron and selling her to traffickers who forced her into prostitution went on trial in a court in Tucuman province, in the north west of Argentina. This case has become over the years a symbol of the fight against human trafficking in Argentina and most of South America. Especially because of what Mrs Trimarco has done over the last decade. In the search for her daughter she infiltrated herself into human trafficking gangs pretending to be interested in "buying" women. The information gathered by these actions led to police raids which rescued dozens of women who were being sexually exploited. Mrs Trimarco later launched the Fundacion Maria de los Angeles, named after her missing daughter. Since 2007 it has helped rescue hundreds of victims of sexual exploitation and human trafficking. She and her husband Daniel, who died in 2010, asked at hospitals, and spoke to police and neighbours about Marita. No-one knew her whereabouts. After several days there was a breakthrough. Someone had seen her being pushed inside a vehicle by three men. And weeks later a prostitute confirmed their worst fears. They were told that their daughter had been "sold" to traffickers. Mrs Trimarco says the authorities in the province at the time, as well as former members of the police and the judiciary, were in collusion with the traffickers, which is why it was so difficult to find her daughter.