Marques was arrested in Ireland on a provisional extradition warrant issued by a United States court on July 29, 2014. The FBI is seeking to extradite Marques to Maryland on four charges — distributing, conspiring to distribute, and advertising child pornography — as well as aiding and abetting advertising of child pornography. The warrant alleges that Marques was "the largest facilitator of child porn on the planet". His attorneys have fought for several years to prevent his extradition to the United States on the grounds that he had Asperger syndrome and would not receive the appropriate care in a US prison, if extradited. In December 2016, the Irish Court of Appeal ruled the extradition should proceed. This was not the end of his appeal process, however, and his lawyers announced they would make a new appeal to the Supreme Court. This appeal was dismissed by the Irish Supreme Court on March 20, 2019. Mr. Marques faces life in prison if tried and convicted in America.