Over the past 40 years, evidence of a plaintiff’s failure to use a seat belt was inadmissible in Texas car accident lawsuits because, even though it could exacerbate the plaintiff’s injuries, it could not, in and of itself, cause a car accident. This rule was a way of protecting plaintiffs from the all-or-nothing effect of the contributory negligence doctrine. Under the contributory negligence doctrine, a plaintiff who was 1% or more at fault for an accident could not recover any compensation from the defendant. The rule originated with case law and was codified, and then the statute was repealed in 2003. In spite of the legislative repeal of the rule, the rule making seat-belt evidence inadmissible still stood, since the case law was still in effect.
In the recent, important ruling in Nabors Well Services, Ltd. v. Romero, the Texas Supreme Court reconsidered the rule banning seat-belt evidence. The case arose when a transport truck collided with a Chevrolet Suburban carrying eight passengers, including three adults and five children who were part of two families. When the transport truck slowed, the driver of the Suburban pulled into the opposite traffic lane and tried to pass. While the Suburban passed, the truck made a left turn and hit the Suburban, which rolled several times and killed an adult passenger and hurt the rest of the people in the car. There was conflicting evidence about who was belted into their seats. All of the occupants were ejected except the driver and one of the children.
The two families sued the transport truck company and its driver. At trial, the truck company tried to introduce expert testimony from a biomechanical engineer that seven out of the eight Suburban occupants were unbelted and that this failure caused their injuries and the fatality. The truck company also wanted to introduce a citation issued to the driver for failing to properly restrain child passengers.
Texas Injury Lawyers Blog

