When you show proof of that claim, vampiretitan it may be taken more seriously. So far I have only seen evidence of the opposite and my research supports the fact by way of a lack in serious theories on how a soul could be captured especially without killing a person.
Soul is lost; body dies. Saying otherwise is worse then saying you can live while being in billions of microscopic separated pieces.
Spirit is detached from body; body dies. Saying otherwise is exactly like saying the above statement.
The Spirit is a mass of energy that is interdimensional, unlike humans they can pass through various planes without having to leave anything behind. Like humans, however, all they must do is desire a return to their home dimension(Spirit Plane) and they will be there just as we need only desire a return to the physical plane. Capturing one by means of energy manipulation is a futile goal.
If you would claim to be capable of stealing souls, I welcome any of you to try stealing mine. I will laugh, but you are welcome to try. :)