@glyph @dalias Yes. And even if some people do manage to circumvent the rule by making their violation of it impossible to detect, there is still value in the rule existing to aid handling of all the situations where this is not the case, and those skillful circumventors are still personally liable for any consequences of their own violation of the rule that emerge later simply because the rule exists.
"Some people might still avoid the rule" is not and has never been a sound reason to not have a rule. "Some people might get away with murder so we won't do anything about the people we actually saw commit murder and who are still stood there holding the smoking gun" makes clear how ridiculous a position it is.