GENEVA -- A U.N. committee compared the Vatican's handling of the global priest sex abuse scandal with torture Monday, raising the possibility that its failure to investigate clergy and their superiors could have broader legal implications.

But the Vatican's top envoy in Geneva, Archbishop Silvano Tomasi, claimed that the Holy See was getting its house in order after a decade-long effort to deal with a global priest sex abuse scandal.

"There has been, in several documentable areas, stabilization and even a decline of cases in pedophilia," he told a committee of experts in charge of the U.N. Convention against Torture and Other Cruel, Inhuman or Degrading Treatment or Punishment, which the Vatican ratified in 2002.

At the Holy See's first appearance before the committee, experts mainly peppered the Vatican with tough questions to be answered Tuesday. For instance, they asked why the report on its implementation of the treaty was almost a decade late, and why the Vatican believes its responsibility for protecting against torture only applies within tiny Vatican City, a nation of less than 1,000 inhabitants.

"I wonder if you could tell us how you ensure that the criminal prohibition against torture in Vatican City covers all individuals for whom the Holy See has jurisdiction," asked committee member Felice Gaer.

Experts said a finding by the committee that the systematic abuse amounted to torture could have drastic legal implications for the church as it continues to battle civil litigation around the world resulting from the decades-long scandal that saw tens of thousands of children raped and molested by priests.

Katherine Gallagher, a human rights attorney for the New York-based nonprofit legal group, the Center for Constitutional Rights, said such a finding could open the floodgates to abuse lawsuits dating back decades because there are no statutes of limitations on torture cases. Gallagher, whose group represents Vatican sex scandal victims, said rape can legally constitute a form of torture because of the elements of intimidation, coercion, and exploitation of power.

"The torture committee's questions really were about sexual violence and rape, and they made it clear that these acts fall within the definition of torture and the Vatican's obligations under the torture convention," she said after the hearing.

"A recognition by the torture committee that this is one of the most significant crimes could really open up a new level of prosecutions and accountability," she added.

But Markus Wagner, an associate professor of law at the University of Miami School of Law, said it was unclear how much U.S. courts would be swayed by a decision by the U.N. committee that clergy sex abuse constituted torture.

"Any such lawsuit would present significant challenges with respect to the classification of these acts as torture -- and the liability of the Catholic Church," he said.

Pope Francis has said he takes personal responsibility for the "evil" of clergy sex abuse, and has sought forgiveness from victims. He has insisted that the church must be even bolder in its efforts to protect children.

On Saturday, members of the Pope's sexual abuse advisory board said they will develop "clear and effective" protocols to hold bishops and other church authorities accountable if they fail to report suspected abuse or protect children from pedophile priests.

Francis announced the creation of the commission last December and named its members in March after coming under initial criticism for having ignored the sex abuse issue.

The U.N. committee, which is composed of independent experts, will issue its final observations and recommendations May 23.

In January, a U.N. committee that monitors a key treaty on children's rights accused the Holy See of systematically placing its own interests over those of victims. That committee rejected the Vatican's argument that it had limited geographical responsibility.