No. The Catholic Church is very prudent in this matter, and her law declares that those relics alone may be publicly venerated which have authentic documents accompanying them, and proving them to be genuine. These documents can be given only by one authorized by the Holy See to grant them. If the documents be lost, no relic may be offered for public veneration by the faithful without a special decree from a Bishop who can guarantee the relic as genuine. But even should a Catholic venerate as a relic some object which is not authentic, such veneration is at least well meant, and directed towards the one whom the object is believed to represent.
Radio Replies Volume 1 by Rev. Dr. Leslie Rumble MSC and Rev. Charles Mortimer Carty
