<P> The film was shot in and around Los Angeles and East Los Angeles and inside the walls of San Quentin State Prison . The main character Miklo is sent to San Quentin , where much of the film 's plot takes place . Several of the then - inmates appear in the film as extras . In addition , several of the prison staff members also appear as others and some facilitated the production of the film by serving as technical advisors . Many members of the staff were given small lines in the film , with the warden giving an extended cameo in a part that is somewhat integral to the plot . In addition , actor Danny Trejo , who appears in the film as Geronimo , had served time in San Quentin before deciding to become an actor . </P>
where was blood in and blood out filmed
Los Angeles and East Los Angeles inside the walls of San Quentin State Prison