It is hard to find "Exceptional" investigators, it seems as if a lot of people are trying to jump on the "Ghost Hunting" bandwagon for some reason. True, there has been a rise in  reported paranormal activity but not just anyone with equipment can be a reliable ghost investigator.

Investigating actually takes some *skill* and in-depth knowledge of the paranormal. I have seen pics where huge orbs are thought of as "ghosts", those which do not emit their own light, and I have seen video footage of *equipment* that supposedly turn off and on by themselves- (of course a person(s) is close to it when it does go off and on, making one wonder if their movement caused it to do so) once again... I will restate my thoughts on the difference between reliable investigating and those copying other websites and television shows, instead of seriously knowing how to investigate a haunting.

My suggestion to you is to be picky about who you have in your home, just because equipment is involved does not, and I mean... does not imply the people using it know how to investigate reliably.

My tip to you in looking for a serious investigator is to:

+ Find a team/person who has been investigating for several years; not just a few months. I might also suggest, a team with no children under the age of 18.

+ Carefully review their "evidence" ... what do you see  or better yet, what don't you see ?

+ If it sounds/looks weird, then it probably is...

+ If people claim to have certain *insights*, ask them to demonstrate-

+ Be weary of "Over-Hype" and pay attention to detail/what is *SAID* and NOT said, that probably should have been.

+ Most of all, just use basic common sense when making a decision, after all... you want a solid investigation with reliable answers.

A reliable paranormal investigator knows how to conduct an investigation. As the old saying goes, the proof is in the pudding.

Ask a lot of questions, and listen to the type of feed back you get. Is it an EVP or not? How do you know? What did you do to get it? "Know" the right questions to ask- be educated and then be prepared.

Remember, please don't just take my word for it- after all, this is just my honest opinion. Also, keep in mind that your home is your castle, and to allow it be invaded by people merely posing as professional investigators is not something that I would recommend. (And by reliable, I mean experienced on what they're doing) in one way or another.
Ask a team/person if Ouija boards are used. I would be careful to trust anyone that claims they can provide an exorcism... From the Commentary of the Code of Canon Law-

Canon 1172 - (1) No one can perform exorcisms legitimately upon the possessed unless he has obtained special express permission from the local ordinary. (2) The local ordinary is to give this permission only to a presbyter who has piety, knowledge, prudence, and integrity of life.

1.     L. Margoni, "Exorcism-The Facts." Last modified 2005. Accessed November 25, 2011.

good night