A secret document which sets out a procedure for dealing with child sex abuse scandals within the Catholic Church is examined by Panorama.
Crimen Sollicitationis was enforced for 20 years by Cardinal Joseph Ratzinger before he became the Pope.
It instructs bishops on how to deal with allegations of child abuse against priests and has been seen by few outsiders.
Critics say the document has been used to evade prosecution for sex crimes.
Crimen Sollicitationis was written in 1962 in Latin and given to Catholic bishops worldwide who are ordered to keep it locked away in the church safe.
It instructs them how to deal with priests who solicit sex from the confessional. It also deals with “any obscene external act … with youths of either sex.”
It imposes an oath of secrecy on the child victim, the priest dealing with the allegation and any witnesses.
Breaking that oath means excommunication from the Catholic Church.
Reporting for Panorama, Colm O’Gorman finds seven priests with child abuse allegations made against them living in and around the Vatican City.
One of the priests, Father Joseph Henn, has been indicted on 13 molestation charges brought by a grand jury in the United States.
During filming for Sex Crimes and the Vatican, Colm finds Father Henn is fighting extradition orders from inside the headquarters of this religious order in the Vatican.
The Vatican has not compelled him to return to America to face the charges against him.
After filming, Father Henn lost his fight against extradition but fled the headquarters and is believed to be hiding in Italy while there is an international warrant for his arrest.