Kautilya's Arthashastra 2.36.10

2.36.10

cikitsakaḥ pracchannavraṇapratīkārakārayitāram apathyakāriṇaṃ ca gṛhasvāmī ca nivedya gopasthānikayor mucyeta, anyathā tulyadoṣaḥ syāt //

Any physician who undertakes to treat in secret a patient suffering from ulcer or excess of unwholesome food or drink, as well as the master of the house (wherein such treatment is attempted) shall be innocent only when they (the physician and the master of the house) make a report of the same to either Gopa or Sthánika; otherwise both of them shall be equally guilty with the sufferer.