The Commissioners direct, that in future the Inspectors on Duty shall not take into custody any person brought in by a Police Constable on the vague charge of “obstructing the Constable in the execution of his duty.” If such a charge is to be made, it must be accompanied by a specification of particulars.Source: Metropolitan Police. Instructions Orders &c. &c. 1836. London: W. Clowes & Sons.
[This is the last of these, which were a series of the very first police regulations ever, in real time, 182 years later. Thanks to the NPIA and the library staff at Bramshill, UK.]