- AAC Tenant Screening and Credit Report Services
 - San Francisco - Services include employee and tenant screening, criminal records check, and credit reports. - Adolescent Guidance Services (AGS)
- Burlingame - Special emphasis is placed on locating and returning runaways through non-violent, crisis intervention techniques. Also offers youth transport services to schools, mental health facilities, wilderness programmes, social engagements, and judicial facilities.
- Background Profiles
- Pleasant Hill - Providing pre-employment screening services for employers nationwide.
- Bender's Legal Service / LRS Investigations
- San Jose - Offering services for subpoenas and daily court filings, investigators for surveillance and asset searches, and more.
- Business Integrity International
- Alamo - Offers investigations, security services, and competitive intelligence.
- CIS Data Systems Inc.
- Albany - Includes credit laws and information.
- Clouthier Investigations
- Walnut Creek - Private investigation services for local and international clients utilizing a worldwide network of agents to find the information needed.
- Derish Associates, Inc.
- San Rafael - Independent investigative and consulting agency with national and international contacts.
- Excelsior Services, Inc.
- Oakland - Devoted to surveillance and covert (hidden) video surveillance. Also does process service.
- Filley & Associates Private Investigations
- San Francisco - San Francisco-based firm specialising in surveillance, and civil and criminal investigations in California, Nevada, China, Korea, and Hong Kong.
- Fog City Investigations
- Novato - Licensed and insured private investigative firm specialising in insurance cases, surveillance, criminal defence, and domestic matters.
- Ginter Investigations, Inc.
- San Rafael - Specialises in workers' compensation and personal injury defence investigations in the greater Bay Area of California.
- Gladding & Michel, Inc.
- Burlingame - National and international full-service investigative agency specialising in corporate intelligence, environmental, product liability, and trial work.
- Hilton Investigations
- Morgan Hill - Provides investigative services to legal, insurance, corporate, and government agencies in Northern California.
- Hire~Safe
- Morgan Hill - Specialises in pre-employment screening to help reduce fraud, liability and minimize employee risk.
- InfoCheck, Inc.
- Pleasant Hill - Offers background screening on a national level. Includes criminal records, credential verification, and all public records.
- Maxwell & Associates
- Benicia - Investigations and mediation to resolve conflicts in the workplace.
- Mercury Investigations
- Oakland - Licensed private investigator provides surveillance, locates missing persons and assets, and performs business identification services.
- Noesis
- San Francisco - Investigative consultancy firm specialising in all areas of white-collar crime and corporate due diligence, with offices in San Francisco and Los Angeles.
- Personnel Profiles
- San Jose - Specialises in providing pre-employment screening and background checks services.
- QSpace@
- Oakland - CreditCheck report monitoring services, featuring a free online copy of your credit report and credit score when you sign up for a free trial. An Experian company.
- Sam Brown Group
- San Francisco - Investigative corporation that provides confidential and immediate services.
- Teller Group, The
- Livermore - Claims management and private investigations firm.
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