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The phrase "directly investigated" is grammatically correct and can be used in written English.
It is often used to indicate that something was examined or studied thoroughly and without intermediaries or outside factors influencing the investigation. Example: The researchers directly investigated the effects of the new drug on patients, without any outside interference.
Exact(60)
However, this was not directly investigated here, and is subject to further investigation.
But he said no one had ever directly investigated how the sounds of dental instruments affected people's brain activity.
Little research has directly investigated reproductive correlates of choice assertion.
The first variable was directly investigated by Langsdorff, Domeniconi, and Schmidt (2015).
Charge transfer interaction between graphene and dopant molecules was directly investigated by spectroscopic studies.
Strain information in the structure has been directly investigated by means of micro-Raman scattering.
Sedimentation tank performance was directly investigated by measurement of the mean concentration along the tank.
In this sense, plant produced mixtures should be directly investigated to obtain reliable performance evaluations.
Busch notes, however, that few studies have directly investigated the effect of land title and tenure policies on carbon storage.
However, to our knowledge no study has directly investigated the roles of the autonomic system in the pathogenesis of RCVS.
Furthermore, the potential for CAR after a shorter bout of sleep – a nap – has not been directly investigated.
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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