So...San Francisco has dubbed itself a "sanctuary city" and has a law requiring it to ignore detain requests from the Federal Immigration and Customs Enforcement service. That's why in April they released the illegal that accidentally shot a woman on the Embarcadero over the weekend.
On the other hand, turns out the gun the sumbitch found on the pier wrapped in a shirt belonged to a Federal agent.
We're from the government. We're here to help.