There can't be a taxi mafia investigation without an investigation into their partners in crime, the local bib.

And where did you read they are not being investigated?

Where did you read they were?

Nowhere.

I would presume they are being investigated, but I don't know for sure and I have seen or read nothing to indicate either way. So all the people claiming 'why are they not being investigated' are presuming and talking about things without knowing what they are telling is true yes or no.

But we can hardly expect the fox to guard the chickens......no matter what colour the fox has.