How could you tell if someone was possessed or under the influence of a spirit?

Question

How could you tell if someone was possessed or under the influence of a spirit?

Answer 1

go here http://fspp.net/warn%20poss.htm

Occult powers or abilities: Anybody who can tell a fortune, lift an object through levitation, break a solid oak board with their hand, etc. using demonic powers needs a deliverance. Martial arts are known for using demonic powers to break boards, etc. Unnatural strength is a sign of demonic power, such as the man with the legion in the Bible.

Unnatural desires and feelings: Sexual attraction towards animals, unnatural sexual desires, unusually strong attractions towards somebody who is married, past lover, etc. can indicate soul ties and demonic bondage.

Experiencing the demonic: Most often (not always, but usually) when people are visited by demons, hearing them, seeing them, etc., they are in need of a deliverance.

Ancestors have similar problems: If both you and one or more of your ancestors have the same kind of problem(s), then there may be a generational spirit at work.

Obsessions: Driving interests in the occult, demons, and creatures of the dark such as wolves, owls, etc. can indicate a demonic bondage. Obsession with death is almost a sure sign of demonic bondage.

Compulsive behavior: Compulsive behavior such as cutting is a Biblical symptom of demonic bondage.

Answer 2

feats of superhuman strength, coldness in the room, foul rotting order, speaking in old languages are some of the signs, acts of impossible physical distortion.

watch the original exorcist movie and you'll see what i mean!