It should also be left unambiguous, so stated clearly in the writing or through examples, that this rule applies not only to gang v gang / mafia v mafia encounters but also for encounters with the police. Too many times I have seen that sort of gentlemen's agreement is formed between gangs and illegal factions in general but as soon as an encounter with the police happened it was ignored and the arguments started that the gun, cash, drugs, whatever is somewhere else.
Pat downs, or frisk searches are not going to be done often, or will lightly be permitted, if someone from the LSPD does it the universal concept behind is that there has been reasonable suspicion and cause for it to happen. Though as far as applicable it is been stated that such actions taken lightly are against policy. So if it happens it can be somewhat ensured that's reason behind it happening, so the rule or the gentlemen's agreement shouldn't just be thrown over. The LSPD are as much players as you and I. If someone violates your fourth, or just you have doubts that the pat down/frisk was reasonable file a report for IAG to handle and we will happily deal with it.