Utilize the input text as a context reference, choose the right relationship between within and Los Angeles from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

There is one large department within the U.S. that we've been undergoing trials with and that is the Los Angeles Police Department.

Answer: headquarters_location