http://www.onepeterfive.com/bishop-slattery-brings-out-the-big-guns-against-satanic-mass-in-oklahoma-city/
and a back-up on my post earlier this past week.
The Leonine prayer of exorcism which Bishop Slattery is sending to the priests (and which is to be said ONLY by priests!) of his diocese is itself taken from the 1962 Rite of Exorcism, and has its origins with Pope Leo XIII, who was said to have had a terrifying vision
of Satan entering the Church, whereupon he composed the prayer to St.
Michael the Archangel as well as prayers of exorcism for priests and
laity alike to use in their fight against Satan.