identifying jinn

[Sahal.ibnSaleem]

assalamu alaikum wa rahmatullah..., i am from kerala,india . i am a muslim and follow principles of salafiyyah in my life.1) my question is about jinn.i find so many hadith about jinns that explains about the effect it can create in our lives . it is true that jinn can exist in the form of a black dog, snake,human . what is the necessary factor that distinguishes the snake jinn and the real snake .dog jinn and real dog .jinn human and real human . 2)it is known that some type of epileptic disorders can be caused by the jinn.how one can distinguish clearly between the jinn epilepsy and medical epilepsy. I FIND THAT SO MANY PEOPLE HERE (india) ARE UTILIZING THE SUBJECT OF JINN TO MISGUIDE PEOPLE AND TO CREATE CONFUSION AMONG PEOPLE