Hi I am not a police officer. I am from the UK and had a holiday recently in San Francisco. It struck me that there are a huge amount of different police forces in the Bay Area - Oakland PD, SFPD, San Mateo County etc.
On a practical day to day level, how does this work? For example, if an Oakland police officer is investigating a crime in Oakland, but needs to knock on doors and speak to people in SF, can he do this himself, or must he request that SFPD do it???
With so many different counties converging, it sounds messy.