Ken Roybal began his career as an LAPD officer in April 1980. From 1997 to 2001 he was assigned as an LAPD Background Investigator at the Administrative Investigation Division. Ken retired from the LAPD in May 2003.

In July 2006, Ken returned to the City of Los Angeles Personnel Department-Background Investigation Division to conduct LAPD background investigations until 2018. Ken was recognized as one of the most senior investigators having conducted approximately 1400 background investigations in 16 years. He was recognized as a Subject Matter Expert in LAPD background investigations.

Ken opened PoliceBackground.Net in 2006 as a website to assist police candidates seeking answers on background investigations. The site has helped hundreds of candidates get the answers they needed to navigate the arduous background investigation.

In 2018, Ken retired from the City of Los Angeles after 35 years of service. In 2019, the new Policebackground.net was then opened with more services including one-on-one counseling with background investigators.