I understand that nothing that investigation presented would ever be allowed in court.
Wrong
If it is not legally admissible as evidence, then legally it is nothing more than unsubstantiated hearsay.
Wrong
you have no concept of how investigations work, reasonable suspicion, probable cause, evidence, discovery, admissible evidence etc....
So in your town private citizens are allowed to conduct official police investigations? Really?
So in your town police investigators are still allowed to participate in investigations despite major conflicts of interest?