Kurt Ullman wrote
Mike Berger wrote

Your local police must be very skilled and have a lot of time on
their hands if they get involved in civil small claims issues and
are expert enough to evaluate the chemicals the workers are using.
In most jurisdictions they wouldn't have the expertise or authority.

They would have the authority in an jurisdiction in the US. It is called criminal fraud.

That expertise is required to work out the difference between
deliberate criminal fraud and just plain hopeless operators that
dont have enough of a clue to use the appropriate materials.

The expertise is another kettle of fish, but
that is easily bought on the open market.

Its MUCH more complicated than that with the proof beyond reasonable
doubt required to prove alleged criminal fraud as opposed to incompetance.