That circular reasoning. Investigations are conducted based on evidence. If there’s no evidence of illegality, then there’s no reason to investigate. You can’t just go violating somebody’s rights because you suspect something. That’s why cops have to get warrants.
If you can produce any evidence that they did anything illegal, then, yes, there should be an investigation into that. 
You investigate to find evidence. That’s the point of an investigation.
That circular reasoning. Investigations are conducted based on evidence. If there’s no evidence of illegality, then there’s no reason to investigate. You can’t just go violating somebody’s rights because you suspect something. That’s why cops have to get warrants.
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