I don't quite understand why the Sheriff didn't join the City and others with SABLE, but something that's obvious that you don't know is that both helicopters have been used by the other agency when needed. Just because the Sheriff's Office has their own helicopter doesn't mean the City's won't help out if it's available.
Vice units make drug busts all the time and you can't expect to have an air unit watching over for all of them. If one of the air units (City or County) was available, they would have responded to assist
I don't quite understand why