Investigative movies that turns dangerous for investigators

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I am looking for not well know but good movies where investigations prove to be more than what's bargained for by investigators.

It could be reporters or police or anyone curious enough to investigate. Examples of such movies

TrollHunter
Tusk
the sacrament



Well, The Blair Witch Project would be a good (if obvious) example of this.



The doors of wisdom are never shut. - 'Socrates'
The Firm (doesn't end well for the investigator)
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Did you know that in the 1980s movie PREDATOR the titular character was not originally portrayed by Kevin Peter Hall. It was in fact Jean-Claude Van Damme donning a much more insect inspired full body suit before he left the production which then led to the recasting and redesigning of the famous hunter.



The Big Fix (1978)
La Isla Minima aka The Marshlands
Ertos Ego aka The Other Me
Kahaani (2012)
The Ghost writer
The Kid Detective
Wind River
Gone Baby Gone
Bedroom Window (underrated)
Copycat
Breach



EDIT: Added more movies.



Make a better place
Last Moment of Clarity (I think it counts)
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"Beliefs don't change facts. Facts, if you're rational, should change your beliefs" Ricky Gervais



These should be more or less fitting. It's been a while since I've seen some of them, so not 100% sure how "investigative" those are.

Cure (1997)
Angel Heart
Dark Waters (1993)
Retribution (2006)
Noroi: The Curse
A Cure for Wellness
Double Vision
The Empty Man
Zeder
The Exorcist III

I suppose quite a few Gialli fit the bill, too. You could even say that something like Fulci's City of the Living Dead is a match. Also quite a few of the found footage horrors seem to be about paranormal investigations gone wrong (still they rarely involve proper investigation).
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8MM
The Maltese Falcon (for Miles Archer)
The Wicker Man
In the Mouth of Madness



Tusk is the best one!



Spoorloos
Dragged Across Concrete
The Ring/Ringu
Cruising
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Recent Viewings (rewatches noted with an *)
Barbarian- (4/5)
Nope- (4.5/5)
Jurassic Park Dominion- 0.5/5
What Josiah Saw- (4.5/5)



TV series examples here but something like Twin Peaks or The X Files?

I would say there's quite a few film noirs where the detective is in over their head.