Appeals Court:

The original question was does the Board of State Examiners
have the power to criminalize Do-It-Yourself plumbing?
The question is not whether the state has police power,
but to what extent this police power authorizes the executive
to make regulations which contravene the laws which establish it.

The Superior Court judgment has added a second question:
To what extent is the Superior Court authorized to depart
from canonical procedure: to countenance fraudulent hearings,
to recognize the pleadings of non-parties?

Whether 30a MGL even under optimal conditions is constitutional
is arguable, but need not be reached.
The procedure implemented by the Board of State Examiners
and endorsed by the lower Court there can be no question
of its unconstitutionality.

Six days' notice is not enough. There was insufficient notice
of the issues: the AR shows that there was no notice at all.