I want to open a business with a guy but some...

Please note that in addition to our previous answer,
That if the people arround you told you to not to trust a guy, then consider that his reputation is broken,
As it's said: There's no smoke without fire
But to be sure, and to have any information about this guy and if he has files against him,
You can ask a lawyer to approach a local Court and ask about if there's previous or actual files concerning this guy

In the event that the intended question is otherwise, you can kindly ask us in detail and we will respond to it in the shortest time frame.