Where the defense usually focuses
Many Prop 65 defense strategies begin with exposure rather than with the mere presence of a chemical. A listed substance can be present in a product without causing an exposure that requires a warning, and the state has published safe harbor levels for many chemicals that frame that question. The business usually carries the burden of showing that exposure falls below the relevant level, which makes the quality of its testing and its assumptions about consumer use central. Other cases turn on whether an adequate warning was already given, whether a federal labeling scheme displaces the California requirement, or whether the pre-suit notice properly covered the products now being sued on. For a few chemicals, courts have limited the state's power to compel a warning when the science is genuinely disputed, an area that keeps developing.
Testing and records that carry weight
Exposure arguments are only as good as the data behind them. Gather prior testing, the methods and laboratories used, batch and lot information, and evidence of how consumers actually use the product, since use patterns feed directly into exposure estimates. If the plaintiff relied on a single sample, find out which batch it came from and whether your production has changed since then. Retained testing laboratories and toxicologists are common in these cases, and engaging them through counsel helps keep the analysis organized and protected where the law allows. Keep upstream suppliers informed as well, because indemnity rights can be weakened by a late tender.
Settlement terms that outlast the case
Many Prop 65 cases end in a consent judgment, and its terms often matter more than the payment. A judgment can commit the business to reformulation targets, to specific warning language and placement, or to both, and it may bind future sales through channels nobody discussed at the table. Civil penalties, payments in lieu of penalties, and the plaintiff's attorney fees are negotiated separately, and the Attorney General reviews private settlements and can object to them. Warning rules, including the short-form option, have been revised, so any warning commitment should track the current regulations. Our early assessment weighs the strength of the exposure claim and the cost of testing against the cost of resolving the case, and asks whether a resolution should be drafted to cover related products before the next notice arrives.
