Think everyone already knows my opinion on this one but I'll say it again for those who don't

1. No, I don't think any form of spiritual input on an investigation is required or indeed useful. Reason being, what exactly is the point? So bloomin' what if someone picks up on a John Jones (not that you frequently even get a surname anyway - meaning its even more pointless!

) What use does that serve to an investigation group unless they're out there solely for the purpose of going out to tell people their property is "haunted" by a Mr So-and-So who died in 1856?
2. Problems with a "spiritualist medium" being there on an investigation for a group that DON'T wish to know/care what they have to say are plenty. Largely involving them feeling only able to "pick up on things" and not focus on what the group is intending on achieving. (In the sake of Otherworld, obviously now wishes to purely gain hard data). If they spend their time focusing on what Mr So-and-So is telling them they're not going to be focusing on recording data like they've been asked to do. Also, other issues I have with the likes of many a "spiritualist medium" is that they seem incapable of NOT saying things that then influence the rest of the group - be it conciously or otherwise. Even just simply saying "I'm picking up on a male presence, the energy feels negative" can instantly put other people on edge. Thereby meaning the presence of someone like that can instantly affect the results of an investigation, meaning the investigation (in my eyes) was ultimately useless and everyone should've stayed at home and watched a good movies instead!

The biggest issue with using a medium as a standalone tool in my eyes is simply that they provide zero evidence of what they're saying is accurate or indeed even remotely true. Lets face it, 99% of the time you only ever get a first name and/or a date or something else that is extremely easy to "guess" at. Probably 75% of those times you'll be given a name that is so ridiculously common (or was during a certain century). Instantly ringing alarm bells in anyone who isn't a medium (or at least I'd
hope that was the case!) And when do you ever get a first name, middle name and last name, the date of this supposed persons birth and the date of their death? In my experience..... NEVER.
Therefore again bringing me back nicely to my first point.... what IS the point in them? Utterly useless on an investigation. Proves nothing and takes time out of them doing something the team is aiming to do.