In Sindell v. Abbott Laboratories the Supreme Court of California created the market share liability theory of recovery for products liability cases. The innovative Sindell theory, which applies to certain products liability cases in which causation is either questionable or difficult to prove, departed significantly from the traditional tort principles of causation and liability. The theory allows plaintiffs to recover damages for their injuries, but it discounts the defendant's liability by the probability that it did not cause the harm.
David A. Fischer, Products Liability-An Analysis of Market Share Liability, 34 Vand. L. Rev. 1623 (1981)