Section 402A of the Restatement (Second) of Torts included a provision that created strict liability on the part of a manufacturer. Under this section, a manufacturer is liable for product defects that occur during the manufacturing process, notwithstanding the level of care employed by the manufacturer. Courts later extended the strict liability principles to include cases that did not involve errors in manufacturing, such as cases involving a failure of a manufacturer to provide ample warnings.
The Restatement (Third) of Torts: Products Liability applies strict liability rules to cases involving errors in manufacturing, but applies negligence rules to other types of products liability cases. Nevertheless, many states continue to apply the strict liability rules that were developed in older cases.