Can we go to a magician only to confirm whether someone is under the influence of magic or not? And where can we find the objects used is magic?

All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.

It is forbidden to go to magicians whether it is to know symptoms and signs of magic or its place or anything else. However, one may go to them to reproach their work and to demonstrate its falsehood, since this is a form of enjoining what is good and forbidding what is bad as the Prophet, sallallaahu ‘alayhi wa sallam, did when he went to Ibn Sayyad (a Jewish soothsayer who lived at the time of the Prophet, sallallaahu ‘alayhi wa sallam).

There are some signs and indications of magic, and a Muslim can know them by himself. Also, he can seek help of some scholars who treat magic by Ruqyah (verses of the Quran, supplications from the Sunnah).

Among these signs and indications are: (1) one's unexpected change from love to hate, (2) one's excessive distrust, extreme solicitude and ultimate hate of some places or people without some clear reason, (3) one's absent-mindedness and unusual glances, (4) deserting people, and (5) one's thinking that he is doing something but, in fact, he is not. In addition to other signs that differ from one person to another.

Allah knows best.