In 2000, he was arrested at the Luis Muñoz Marín International Airport when he was returning from a trip to Argentina.
A Grand Jury indicted him on 44 charges of fraud, extortion, and money laundering.
In the process, he testified against contractor José Cobián Guzmán, and former Speaker of the House Edison Misla Aldarondo in another federal case against them in 2002.
However, because of his cooperation in the cases against Cobián and Misla Aldarondo, Valentín received only 18 months of sentence, and six years on probation.
[3][4][5] Valentín has also been linked to an incident on January 11, 1975, at the Mayagüez plaza, where two young men were killed during an activity of supporters of the independence movement to celebrate the birth of Eugenio María de Hostos.