That is kind of funny as there was a scoop and go policy for Hospital cases in the 60s and 70s. They stopped doing it because of the legal ramifications when the gang Bangers families would sue when the doer died.
302 is a State Mental Health reference to a warrant that is sworn out by 2 Physicians saying that someone is a danger to themselves or others. If police have the original warrant they take that person into custody.
As we said before when there is a suspicious package or bomb concern no transmissions by radio, that's what they put out first so you know it's a bomb threat.
For the o p. It sounds like there are several meanings for a code blue other than the official documented regulated reason in the directives for that reference. Medics reference to someone not breathing in addition to shelters that are open for the homeless in cold weather seem to be the most logical, ask any cop.
That day you heard that on a 70 degree day could have had something to do with a call dealing with an off-duty cop. Who knows, lots of unofficial slang out there. We have gotten way OT and it's interesting how many opinions there are. I've been listening to Philadelphia over 50 years, I learn something new everyday.