How do we know that a jinn has possessed a human?

The questioner : Then how does one know that a person has been possessed by a jinn?

The Shaykh : This is, by Allah...

The questioner : Or is it a purely ijtihad-based issue?

The Shaykh : Perhaps they have manifestations, and it is sufficient to note that the possessed patient has repeatedly sought treatment from materialist doctors, and since their medicine has not succeeded in curing him, he becomes convinced that he is perhaps possessed. He becomes convinced that he is perhaps possessed, so he goes to someone known for reciting over people like these. However, there is a disturbing phenomenon now, and that is that people—Bismillah—I wanted to say that the possession of humans by jinn is a legal reality that cannot be denied. In the Noble Qur'an, there is a verse in which our Lord, Mighty and Majestic, compares those who consume riba. This verse indicates that Satan touches a human and possesses him, causing him to fall into convulsions. The convulsions of a human are a real fact that cannot be denied, because we see him throw himself to the ground, foam comes out of his mouth, and his physical manifestations develop. Medicine admits that it has no treatment for this phenomenon, whereas the Prophet (peace and blessings be upon him) treated some people in his time by reciting some of the Noble verses and addressing the Satan that was possessing that person. Then some of the distinguished scholars followed this path, whom we believe are the scholars furthest from superstition and charlatanism, and that no jinn would walk under them, namely Shaykh al-Islam Ibn Taymiyyah (may Allah have mercy on him). He was famous for treating people afflicted like these. This is a reality that cannot be denied.