I'd like to point out that i know some scary shit happens and some things are difficult to explain, but to resist seeking rational explanations in favour of the supernatural is a very limiting behaviour. MOST things can be explained, some though are very puzzling and appear to defy explanation. All that means is that the real explanation hasnt been found, not that it cant be found.
Some of the difficulties are in the transmission of the information. The perception of the eye witness, the beliefs of the eye witness, the agenda of the eye witness etc etc. Details and language used in conveying the story can alter based on these points. So even the hardest demonic possession scenarios available needs to be revisted from scratch and the witness testimony firmly tested before it can possibly be accepted. This is called evidence for a reason, it has to stand up to scrutiny.
In court an eye witness is scrutinised to validate or invalidate the testimony. If a person reports hearing screaming and states the time and duration and also the distance they were away (think Oscar Pistorias case) then they can expect that testimony to be tested to see if it is valid, i.e just because they say it happened that way is not taken as FACT.
Damn my slow typing, the conversation has moved on, LOL ...