+1 It was only once he realized that his other character was involved he left the situation; while that may have been OOC information, and it did act slightly for his own benefit, there is a longstanding de facto rule that police do not investigate their other characters and DAs don't prosecute their other characters. There was a conflict of interest in this situation which clearly made it inappropriate for the player to continue engaging in the RP situation, there is no reason that he should be punished as he was simply following the longstanding rule of not interacting with your other characters, which he also could have been punished for if he continued the investigation, which would also lead to him being banned because of his POs. Secondly, as Smokey points out, besides the conflict of interest principle that has been clearly laid out and enforced, if Chief Sosa continued this RP situation and arrested his Out-of-Character friend and took his firearm as would be proper and standard procedure in a case like this, he would be transferring the firearm from one of his characters to another via the arrest, and benefiting from giving the firearm to the evidence locker in exchange for in-game money.
For these two clear and substantiated reasons, one of which draws upon long-standing rules that affect police and DA characters, thereby affecting him at the moment, and the second being that if he did not call off the RP interaction he would be committing a greater offense by transferring items to another one of his characters for his own benefit, I believe that this ban should be completely lifted and the note removed.
@Aiden Why don't you retort instead of just calling me dumb?