What are the conditions for valid sanction for prosecution of accused?

[Educator]

In the present case it has not been satisfactorily proved that the Commissioner of the Corporation had been authorised by the State Government or the local authority to issue the necessary sanction for prosecuting offenders under the Prevention of Food Adulteration Act. In the absence of such proof, Ext. P4 cannot be accepted as a proper and valid sanction or authority as required by Section 20