First-class relics of saints are the physical remains, such as flesh, bone or blood. Second-class relics are items that were regularly used by saints and holy people. Third-class relics are items that have been touched to first-class relics. There are also relics that are associated with Jesus, such as the True Cross and other relics of the Passion. To ensure against abuses in this matter, the Church controls the distribution of relics for legitimate purposes. She also requires formal ecclesiastical documentation of its authenticity before it can be used in any public veneration.