Causation in a negligence case works by establishing a direct connection between a person’s careless conduct and another person’s injury. In other words, it must be shown that the defendant’s actions or failure to act caused the harm and that the harm was sufficiently connected to the negligent conduct under the law.
For example, if a driver runs a red light and hits another vehicle, causing the driver inside to suffer injuries, causation connects the negligent driving to those injuries. Understanding “what is negligence” is important here because a claim generally requires more than proving that someone acted carelessly.
Negligence occurs when someone fails to exercise reasonable care under the circumstances, and that failure results in harm to another person. A personal injury lawyer can help determine whether the available evidence establishes this connection and supports a compensation claim. Here’s how causation actually works.
Identify the Negligent Conduct
The first step in establishing causation is identifying what the defendant did wrong or failed to do. This could involve distracted driving, speeding, failing to maintain a property, or ignoring a known safety hazard. The specific conduct matters because it provides the starting point for determining whether the defendant’s actions led to the injury.
Establish Actual Cause
The next step is determining whether the defendant’s conduct was an actual cause of the injury. This is often considered through the “but-for” test, which asks whether the injury would have occurred if the defendant had acted appropriately.
For example, if a driver is texting while driving and hits another vehicle, the injured person may argue that the crash would not have happened if the driver had been paying attention. This can help establish a direct connection between the negligent behavior and the accident.
Determine Proximate Cause
The actual cause is only part of the analysis. Courts may also consider proximate cause, which focuses on whether the injury was a reasonably foreseeable result of the defendant’s conduct.
For instance, a driver who speeds through a crowded intersection could reasonably anticipate causing a collision. Injuries resulting from that collision may therefore have a sufficiently close connection to negligence.
Connect the Negligence to the Specific Injury
Simply proving that an accident occurred does not automatically establish that every medical problem afterward was caused by that accident. Medical records, treatment notes, diagnostic tests, and statements from healthcare professionals can help establish when an injury occurred and whether it is consistent with the accident.
Simply proving that an accident occurred does not automatically establish that every medical problem afterward was caused by that accident. Medical records, treatment notes, diagnostic tests, and statements from healthcare professionals can help establish when an injury occurred and whether it is consistent with the accident.
For example, under California Civil Code § 1714, a person is generally responsible for injuries caused by their lack of ordinary care, which makes evidence connecting the negligent conduct to the specific injury especially important in a personal injury claim.
Consider Other Possible Causes
Causation can become more complicated when several factors contribute to an injury. A person may have a pre-existing condition, another individual may have contributed to the accident, or a separate event may have affected the person’s recovery.
Insurance companies may sometimes use these factors to argue that the defendant was not responsible for all of the claimed injuries. An injury lawyer can examine the circumstances and evidence to determine how the different factors may affect the claim.
Use Evidence to Establish Causation
Strong evidence can make it easier to demonstrate how the negligent conduct led to the injury. This may include:
- Police or accident reports
- Medical records and treatment documentation
- Photographs and surveillance footage
- Eyewitness statements
- Vehicle or property damage records
- Expert testimony
- Employment and financial records
Together, these sources can help create a clear timeline from the negligent act to the accident, injury, and resulting losses.
Key Takeaways
- Determine what the defendant did wrong.
- Show that the injury would not have happened without the defendant’s actions.
- Show that the injury was a foreseeable result of those actions.
- Link the specific injury to the negligent conduct.
- Look at pre-existing conditions or other contributing factors.
- Medical records, reports, photos, and witness statements can help.
- A personal injury lawyer can help investigate and establish causation when liability is disputed.