Pope Leo XIII wrote a prayer of exorcism and he wanted the faithful to pray the Rosary & then recite his prayer. This is a preventative measure. Said privately in this manner it doesn’t violate Canon Law. This is usage is clearly different than those prayers involving those suffering from the extraordinary attacks of the devil.
Code:
I have a copy of the Latin letter of Cardinal Joseph Ratzinger titled "Inde Ab Aliquot Annis On The Current Norms Governing Exorcisms, Sacred Congregation for the Doctrine of the Faith, September 29, 1985 and the English translation of the same with commentary by Fr. Gabriele Amorth.
Personally, I thought differently until I asked about it. I will post some of my findings:
Thomas Euteneur wrote a book called "Exorcism and the Church Militant. " Appendix E, pages 260-266 of that volume is titled “Commentary on the 1985 Letter of the Congregation for the Doctrine of Faith: On the Current Norms Governing Exorcisms.” Euteneur conclusions agree with Fr. Amorth concerning laity & private exorcism or prayer, & the Exorcism Prayer of Pope Leo XIII. Eutenuer goes further citing Fr. Francis Martin in the footnotes on page 263:
"Fr. Francis Martin clarified the cardinal’s (Ratzinger’s) letter in a talk at Mundelein Seminary, and latter through personal correspondence. He stated that it is clear the restrictions in point three of Cardinal Ratzinger’s letter are to be applied to pubic assemblies. He also wrote, “When asked by Fr. Rufus Pereira concerning the third paragraph of [the] statement of the Congregation of the Doctrine of the Faith, September 29, 1984 [actually 1985] the then Prefect of the Congregation of the Doctrine of the Faith, Cardinal Joesph Ratzinger, stated that the restrictions apply to public assemblies. While Cardinal Ratzinger (now Pope Benedict XVI) clearly restricts exorcisms and prayers for exorcisms to authorized clergy, there is nothing here to prohibits the laity from using the imperative. “Exorcism” means the Rite of Exorcism not the imperative command.” (page 148)
Fr. Francis Martin is a renowned Scripture scholar and Professor Emeritus of New Testament at the Dominican House of Studies in Washington, D.C. He was Senior Fellow at the Intercultural Forum for Faith and Culture at the John Paul II Cultural Center in D.C. and visiting professor at Sacred Heart Major Seminary in Detroit, Michigan. In the past, he has taught at the Gregorian University in Rome, Ecole Biblique in Jerusalem, Catholic University in Washington, D.C. and held the Cardinal Adam Maida Chair in Biblical Studies at Sacred Heart Major Seminary. He has also taught at Franciscan University of Steubenville and the John Paul II Institute for Studies on Marriage and Family in Washington, D.C. He was ordained at St. Joseph’s Abbey in 1956, received his Licentiate in Sacred Theology (S.T.L.) from St. Thomas Pontifical University in Rome in 1959 and his Doctorate in Sacred Scripture (S.S.D.) from the Pontifical Biblical Institute in 1978, also in Rome. Fr. Martin is a priest of the Archdiocese of Washington, D.C. where he is also chaplain of the Mother of God Community in Gaithersburg, MD.
Said of Francis Martin:
“I have had the privilege of knowing and working with Fr. Francis Martin for many years. His profound knowledge of and love for the living Word of God continues to inspire me. He continues to help people in all walks of life to open their hearts to Christ, the living Word Incarnate. I warmly recommend Fr. Francis Martin Ministries to one and all.”
Most Rev. William E. Lori
Archbishop of Baltimore
“What a blessing to be a priest in a time such as this! Our world is in such desperate need of the love and truth you can offer. Please know that I pray for you and your priesthood. I am joined in this prayer by my long-time friend Fr. Francis Martin. He has been the main teacher at our priest conferences over the years since their beginning in 1975. I encourage you to… take advantage of his offering. I know you will be blessed by this spiritual resource.”
Fr. Mike Scanlan, CFR
Monsignor Andrea Gemma, former bishop of Isernia-Venafro [served 1990-2006] & once the Vatican’s Head Exorcist before being consecrated a Biship, is among the greatest exorcists living. Mons. Gemma was the Head Vatican exorcist prior to becoming a Bishop. He is famous for titles such as “The Gates of Hell Shall Not Prevail” & " I, Bishop Exorcist,"
The link below connects one to a Bishop Gemma interview by Gianluca Barile
Interview With Mons. Andrea Gemma
"My experience daily - says, in fact, the prelate - tells me that the exorcism done by telephone is immediately effective, as evidenced by the reactions on the other side of the wire. Moreover, for those who are spirit local distance does not matter; has the power of prayer and exorcism, as I always say, is nothing more than a prayer that is made in the name of Christ and the Church. The devil then you can fight from a distance. Consider that the great Pius XII exorcised Hitler directly from the Vatican, although, unfortunately, in that case, without effect. " Many lay people, including most ‘charismatic’, is slowing in advancing the ministry of deliverance with the fear of breaking a rule of the Church and of falling into sin. Another legend holds that Monsignor Gemma to debunk. "If everything is done in private, the prayers of deliverance and exorcism also imperative - that of Leo XIII in Latin can be a great example - there is no sin. It is, indeed, an act of fraternal charity, of which I can personally testify to the effectiveness. " An act of charity that does not absolutely require the approval or the mandate of the diocesan bishop. "