Product Identification Defense

The product identification defense is a challenge asserted by a defendant in a mass tort case — most commonly in asbestos, talc, and other multi-manufacturer chemical exposure litigation — arguing that the plaintiff cannot prove exposure to that specific defendant's product, as distinguished from a similar product made by one of several other manufacturers who supplied the same industry, worksite, or product category during the relevant exposure period. Product identification is a distinct and often more fundamental hurdle than general or specific causation, because it fails at the threshold factual question of whether the defendant's product was present at all, before any question of whether the product caused the plaintiff's injury is reached — a problem compounded in cases involving exposures that occurred decades earlier, unbranded or commodity products, or workplaces that used products from many manufacturers interchangeably over time. Plaintiffs typically respond with co-worker testimony, purchase and supply records, employer records, and, in some jurisdictions, a substantial factor or frequency-regularity-proximity standard that allows a jury to find product identification satisfied based on evidence that the defendant's product was regularly present at the worksite during the exposure period, even without direct proof the plaintiff personally handled it. Some jurisdictions have rejected looser identification standards in favor of requiring more direct proof, making the applicable standard a significant jurisdiction-specific variable.

Product identification strength varies enormously within a single mass tort docket depending on each claimant's specific work history, product recall, and available corroborating witnesses, making it one of the most important claim-level screening criteria for funders assessing individual claim quality within a multi-defendant docket.

Funders should weight claims with strong contemporaneous documentation or credible co-worker witnesses more favorably than claims relying solely on a plaintiff's own recollection of products used decades earlier, since product identification failure is a common basis for summary judgment even where general causation and injury are not seriously disputed.