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'been investigated' is correct and usable in written English.
You can use it when referring to an investigation that has been carried out in the past. For example, "The matter has already been investigated, and no further action is needed."
Dictionary
Exact(60)
"It's been investigated ad nauseam".
Mr. Chatty's motive "has not been investigated".
Other letters have also been investigated.
The 67th has been investigated for planting guns".
Another brother, Omar, has also been investigated for drug offences.
The suspect had been investigated by the F.B.I., twice.
These concerns have never been investigated or addressed.
But that theory has not yet been investigated.
James Yee, had been investigated on suspicion of disloyal conduct.
Coke has been investigated by antitrust authorities across the globe.
The problem has been investigated and the solution identified.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com