Canonum De Ius Positivum
Canons of Positive Law
VII. Law
7.8 Force of Law
Article 289 - Force
Canon 3167 (link)
In the absence of proper authority, no use of force by an official is lawful.
Canon 3169 (link)
Enforcement is unlawful unless the obligation sought to be enforced is clearly defined by some valid deed and the person to whom the enforcement is directed has previously consented to perform the obligation. Enforcement is always unlawful if sought against any implied obligation, or claimed secret agreement.