That's precisely what I feel this rule would prevent, Octavian.
The rule does not say that the Judge Advocate will conduct a Public Investigation of these occurences. It only states that he or she will investigate the matter. It implies that a "full-blown" Public Investigation would only occur if the JA deems it necessary.
And I'm not entirely sure how this rule detracts from the flow of the game either. If the automatic investigation reduces the number of PIs, it would seem to enhance the flow of the game.
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If Bob is devoiced by an operator at the instruction of the DP during a turn chat, he has the right to request an investigation of this action. However, if he does not request an investigation and such action goes unchecked or unchallenged, we would be establishing a precedent for said actions.
Therefore, the Judge Advocate investigates the matter on behalf of the nameless, faceless individual who may or may not be subjected to this action in the future. If the JA finds no fault in the devoicing action (ie. the action was warranted - the "victim" was unruly or incessantly disruptive during the chat, etc...), he or she should post a summary of this finding in the Judiciary thread.
If, on the other hand, the action is dubious or potentially unfounded, the Judge Advocate initiates a Public Investigation of the matter. Pleast note that the Judge Advocate is not ruling on the matter, he or she is simply stating that the action needs further review by the entire judiciary and should possibly be voted on by the citizenry. The case may still be dropped due to lack of merit or eventually dismissed.
Certainly the time spent in this cursory investigation would last much less than the time we have spent debating the rule itself. I think the rule serves to protect the citizens from undue abuse of power and preserves the smooth flow of the game by potentially reducing the number of frivolous Public Investigations that would surely result from these devoicing actions without the existence of this rule.