Evidence guide
What Evidence Do You Need for a California Personal Injury Claim?
A practical evidence checklist for California injury claims covering liability, medical causation, damages, insurance, digital files, preservation, and organization.
Direct answer
What evidence do I need for a personal injury claim in California?
A strong California injury file usually contains evidence of what happened, who was responsible, how the event caused the injury, and the resulting financial and human losses. The useful records vary by case, but commonly include photographs and video, witness contacts, incident reports, medical records and bills, wage evidence, insurance documents, correspondence, and records of future needs. Preserve original files and metadata.
Key points
What matters most
- Organize proof around liability, causation, damages, and insurance.
- Keep original digital files rather than screenshots alone.
- Send preservation requests before routine deletion destroys video or records.
- A complete chronology makes gaps and missing proof visible early.
Evidence showing what happened and who controlled the risk
Collect scene photographs, video, diagrams, measurements, reports, witness details, ownership information, contracts, policies, and communications. In vehicle cases, preserve vehicle and roadway evidence. In premises cases, identify the exact condition and property controllers.
For institutional, professional, or commercial claims, policies, training, supervision, complaints, inspection records, schedules, and internal communications may become important. Some of this proof must be requested from another party and can be lost through routine retention practices.
Medical causation and treatment records
Keep emergency, primary-care, specialist, therapy, imaging, pharmacy, and prior relevant records. Maintain a provider list with dates and contact details. Give accurate histories and describe functional changes consistently.
The issue is not simply whether treatment occurred, but whether the incident caused or aggravated the condition and what care is reasonably needed. Prior health history should be addressed rather than hidden.
Financial and functional losses
Save every bill, explanation of benefits, receipt, mileage or transportation expense, medical-device cost, home modification, and out-of-pocket payment. Obtain employer verification, pay records, tax documents, schedules, leave records, and work restrictions for wage claims.
For daily-life effects, a concise log can identify sleep disruption, mobility limits, missed activities, help from family, and recovery milestones. Keep it factual and avoid turning it into an advocacy diary.
Preserve digital evidence correctly
Keep original photographs, videos, texts, emails, voicemails, app data, and social-media content with dates and metadata. Back up files without editing or recompressing the only copy. Record who created each file and what it shows.
Do not delete unfavorable material after a dispute arises. Evidence preservation applies to both sides. Limit new public posts and discuss collection methods with counsel before accessing private accounts or recordings.
Create one reliable case chronology
Build a date-ordered list of the incident, symptoms, providers, missed work, insurer contact, reports, bills, witnesses, and important communications. Link each event to the supporting document.
An organized file improves legal review, exposes missing records, reduces inconsistent dates, and supports a more accurate evaluation. Keep sensitive records in secure storage rather than ordinary email threads when possible.
Frequently asked questions
Questions about this issue
Do I need the police or incident report before contacting a lawyer?
No. Provide the agency, report number, location, and known details; the report can often be requested during review.
Should I photograph injuries over time?
Yes, when appropriate. Use consistent lighting and dates, preserve originals, and keep the images private and secure.
What if a business has the surveillance video?
Send a prompt, specific preservation request identifying the date, time, location, and relevant period. Video may be routinely overwritten.
Are screenshots enough?
They can be useful, but preserve original files, URLs, exports, metadata, and context when possible.
Primary sources