Ratzinger wrote a letter asserting the church's authority to investigate claims of abuse and emphasizing that church investigators had the right to keep evidence confidential for up to 10 years after the alleged victims reached adulthood.
Ratzinger became upset -- and slapped Ross's hand -- when ABC News Chief Investigative Correspondent Brian Ross asked him a question in 2002 about the delay in pursuing sex abuse charges against Maciel.
But by 2004, Ratzinger had ordered an investigation of Maciel, and after becoming pope, he ordered Maciel to do penance and removed him from the active priesthood. After becoming pope Benedict spoke openly about the crisis, but he was repeatedly accused of having participated in a coverup.
In April 2010, Benedict and other officials were accused by members of BishopAccountability.org of covering up alleged child abuse by 19 bishops.
At the time, the Pope told reporters he was "deeply ashamed" of the allegations of sex abuse by his subordinates and reportedly said, "We will absolutely exclude pedophiles from the sacred ministry."
Several other accusations followed from alleged victims around the world, prompting Benedict to make a public statement later that month from St. Peter's Square in the Vatican. In his speech, he said the Catholic Church would take action against alleged sexual abusers. The Pope described a tearful meeting in Malta with eight men who claimed to have been abused by clergy there.
"I shared with them their suffering, and with emotion, I prayed with them," said Benedict, "assuring them of church action."
In 2010, he personally apologized to Irish victims of abuse.
"You have suffered grievously, and I am truly sorry," the pope wrote in an eight-page letter to Irish Catholics. "Your trust has been betrayed and your dignity has been violated."
But for those who advocate on behalf of the victims, the pope's words did not go far enough.
"Tragically, he gets credit for talking about the crisis," said David Clohessy, executive director of SNAP. "He only ever addressed the crimes and never the cover-ups. And only in the past tense, which is self-serving. Sex crimes and cover-ups are still happening."
Clohessy called the meetings the pope had with victims "symbolic gestures."
"This controversy that has reached even the highest office of the Vatican won't go away until the pope himself tells us what he knew, when he knew it, and what he's going to do about it," said the Rev. Richard McBrien, a Catholic priest and professor of theology at Notre Dame University.
Lena, the Vatican's U.S. lawyer, declined to comment on charges that Benedict had participated in a cover up, but said the fact that two major cases against the Church in U.S. courts, including the Murphy case, had "been dismissed by the plaintiffs themselves, speaks volumes for the strength and integrity of those cases."