It has been in the news lately that Cardinal Robert McElroy has removed Msgr. Stephen Rosetti from the post of exorcist for the archdiocese of Washington, DC., after some comments he made about UFO sightings and demons: Washington archbishop removes priest as exorcist after comments on UFOs and demons | National Catholic Reporter
"The archbishop said Rossetti's statements "linking UFOs to demonic presence and the Center's recent use of social media gravely undermine the Church's very precise teaching on the devil, demons and exorcism."
So I thought it might be useful to explore what the Church's teaching on exorcism and exorcists actually is. From the USCCB site on that subject: Exorcism | USCCB