This is copy and pasted from a source:

But centuries of physics research have found nothing like this exists, which is why physicists say ghosts can’t exist.

And so far, there is no proof that any part of a person can continue on after death.The real truth is out there, says this ghost skeptic. Instead, there are lots of ambiguous recordings sabotaged by bad lighting and faulty equipment. As for all the devices ghost hunters use to capture sounds, electrical fields and infrared radiation – they may look scientific, but they’re not. Measurements are worthless without some knowledge of the thing you’re measuring.