No. Telling someone you are going to investigate them is telling them you are going to investigate them.
There is nothing threatening about investigation.
Hey Andy -- taking this over to the appropriate thread in lieu of the post-game thread. I didn't want to pile on the off-topic posts over there.
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"There is nothing threatening about an investigation" -- I think (at times) that's a disagreeable statement but for the purposes of argument, okay, there's nothing threatening about an investigation, fine.
There is, however, something threatening about threatening an investigation.
In case it's not already extremely clear: there is not, and never will be an investigation by Brown's posse because they are not LEOs; they're his unprofessional, unqualified friends. The only purpose that text served was to convey the threat of an investigation that was never going to happen.
One's subjective interpretation of a threat as not being threatening to them (likely in a physical sense) does not mean the act in question is not a threat.
If a guy texted my totally hypothetical daughter, telling her that his friends were going to uncover dirt on her, and those friends were not LEOs, and in fact had a criminal record, you can be sure that I'm going to take that as a threat.