Your Sierra Madre Private Investigator for Surveillance and Investigations
Bear Witness is the private investigator in Sierra Madre that families, attorneys, and businesses call when they need facts, not guesses. Sierra Madre is a city of about 11,000 people in Los Angeles County. We are a veteran-owned, California-licensed firm (PI #18755), and surveillance is what we do best.
Whether you suspect a cheating spouse, need evidence for a custody or support case, are dealing with a questionable workers’ compensation claim, or represent a client who needs court-ready surveillance, our Sierra Madre investigators plan each case around the subject’s real routine and document it with time-stamped video.
Why Surveillance Is at the Heart of Every Sierra Madre Case
As a Sierra Madre private investigator, surveillance is the core of what we do. We document activity legally, discreetly, and in a way that holds up in court.
Mobile Surveillance
We follow the subject by vehicle through Sierra Madre and beyond, keeping distance and cover so they never know we are there.
Static Surveillance
Discreet observation of a home, workplace, or business from a lawful public vantage point, documenting who comes and goes.
Two-Investigator Teams
For careful or unpredictable subjects, two investigators trade off so the same car is never seen twice.
Every Sierra Madre surveillance plan is built around where your subject actually lives, works, and spends time — not a generic template.
How a Sierra Madre Private Investigator Can Help
Four kinds of clients call us most — and surveillance is at the center of almost every case.
Personal Cases
- Nanny & daycare surveillance — observing caregiver conduct and advising on what in-home recording is legal.
- Runaways & missing persons — people-location work to find someone who has gone missing or run away.
- Infidelity & cheating spouse — documenting where a partner goes and who they meet, without them knowing.
Family Law Cases
- Cohabitation — documenting cohabitation that can affect spousal support under Family Code 4323.
- Lifestyle investigations — documenting spending, activities, and lifestyle relevant to support claims.
- Child support — uncovering unreported work that affects support.
- Divorce investigations — facts and evidence your family law attorney can use.
- Child visitation — observing whether visitation terms are being followed.
- Child custody — parenting-time compliance, home conditions, and welfare concerns.
Business Cases
- Workers’ comp fraud — comparing a claimant’s real activity to reported restrictions.
- Business partner surveillance — verifying what a partner or associate is really doing.
- Employee theft — facts for Sierra Madre employers before they confront anyone.
- Injury claims — showing what a claimant can really do.
- Insurance defense — claim investigations built for insurers and their attorneys.
Law Firm Cases
- Evasive subpoena service — serving witnesses and parties who are avoiding service.
- Witness statements — locating witnesses and taking their statements.
- Court testimony — investigator testimony in California courts when needed.
- Surveillance — surveillance your client’s case can stand on.
- Records research — the records behind the story.
- Evidence gathering — facts collected to evidentiary standards.
The Bear Witness Difference in Sierra Madre
Not every Sierra Madre private investigator specializes in surveillance. Here is what makes Bear Witness different.
Court-Ready Evidence
Time-stamped video, detailed reports, and investigator testimony that stand up in court.
Statewide Coverage
From Sierra Madre to the rest of California, we follow subjects wherever the case leads.
Available 24/7
Nights, weekends, holidays — we work when your subject is active.
Licensed & Veteran-Owned
A veteran-owned firm licensed by the California Bureau of Security and Investigative Services.
Direct Access to Your Investigator
One investigator from your first call to your final report, with updates along the way.
Honest Results
If nothing is going on, we tell you. A clear answer is the goal, not more billable hours.
What Our Clients Say
Real reviews from Bear Witness clients across California.
“James, thank you for stepping in and helping out our law firm! You came highly recommended to us by a colleague as the go-to-guy for all things surveillance. Good communication skills & excellent work!”
“Excellent communication, insight, and follow-through skills. Very impressed with your surveillance video. Excellent work. Thank you! Will refer to friends in need.”
“Of all the private investigators I have used, the Bear Witness Detective Agency has proven to be the only investigation company I can completely rely on and trust. When I need smart surveillance investigators who get the job done right, they are always at the very top of my call list.”
Names and/or locations altered for client privacy. Read more client reviews →
Sierra Madre Cases and the Los Angeles County Courts
Sierra Madre sits roughly 23 miles from Los Angeles, the Los Angeles County seat, where the main Superior Court of California, County of Los Angeles facilities are located.
If your Sierra Madre matter ends up in the Superior Court of California, County of Los Angeles, documentation quality decides whether the evidence helps. We keep chain-of-custody records and write reports in plain chronological order.
Nearby Areas We Cover
Cases rarely stay inside one city limit. From Sierra Madre, we regularly work:
Straight-line distances from Sierra Madre.
Working With a Sierra Madre Private Investigator, Step by Step
- 1
Call Us
A short, private conversation about your situation, with no obligation.
- 2
Strategy
We decide when and where surveillance in and around Sierra Madre is most likely to answer your question.
- 3
Fieldwork
One investigator handles your case from start to finish.
- 4
Results
Documented findings in plain language — including a clear “nothing found” when that is the truth.
Questions About Hiring a Private Investigator in Sierra Madre
Do you also cover Arcadia and Monrovia?
Yes. Arcadia is about 3 miles from Sierra Madre and Monrovia about 4 miles, and both are part of our regular coverage in Southern California.
What does a private investigator in Sierra Madre do?
We document facts for personal, family law, business, and legal cases — most often through surveillance, along with background research, people location, witness statements, and process serving.
Do you specialize in surveillance?
Yes. Surveillance has been Bear Witness’s specialty since 1996, and it is part of nearly every case we handle in Sierra Madre and across California.
Is everything I tell you confidential?
Yes. Your case is handled by your assigned investigator and never discussed with anyone outside the firm.
What if the investigation finds nothing?
You get an honest report that says so. A clean result still answers the question.
Is surveillance legal in Sierra Madre?
Yes, when done correctly. California allows observation in public places where there is no reasonable expectation of privacy. Our investigators do not trespass, use hidden vehicle trackers, or record private conversations.
Do you work with Los Angeles County attorneys?
Yes. Law firms use us for evidence gathering, surveillance, witness statements, records research, evasive subpoena service, and court testimony.
Can you catch a cheating spouse in Sierra Madre?
We can document what your spouse actually does and who they meet, with time-stamped video and a written report, and give you a clear answer either way.
How is a Sierra Madre investigation priced?
Surveillance is billed by time. After a free consultation, you get a written estimate before any billable work begins.
Ready to talk to a private investigator in Sierra Madre? Call 1(877)PROOF-24/7 for a free, confidential consultation.