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⚖️ '''Exposure trigger theory''' is a legal doctrine used to determine which [[Definition:Insurance carrier | insurer's]] [[Definition:Policy | policy]] is activated when a [[Definition:Policyholder | policyholder]] suffers harm from a long-latency hazard — such as asbestos, environmental contamination, or occupational disease — where the injurious exposure occurred over a period spanning multiple policy years. Under this theory, every policy in effect during the period when the claimant was actually exposed to the harmful substance or condition is "triggered," meaning each of those insurers may be called upon to respond to the [[Definition:Claims | claim]]. The doctrine emerged from, and has been most extensively litigated in, the context of U.S. [[Definition:Liability insurance | liability insurance]] disputes, though its principles resonate in long-tail [[Definition:Coverage | coverage]] disputes worldwide.

🔍 In practice, applying the exposure trigger means identifying the specific time window during which harmful exposure took place and then mapping that window against the succession of [[Definition:General liability insurance | general liability]] or [[Definition:Employers' liability insurance | employers' liability]] policies that were in force. If a worker was exposed to asbestos from 1965 to 1985, for example, every insurer on the risk during those twenty years could face liability. This stands in contrast to competing trigger theories: the [[Definition:Manifestation trigger theory | manifestation trigger]], which activates only the policy in effect when injury or disease becomes apparent; the [[Definition:Injury-in-fact trigger theory | injury-in-fact trigger]], which looks to when actual bodily injury occurred; and the [[Definition:Continuous trigger theory | continuous trigger]], which treats every policy from first exposure through manifestation as triggered. The landmark U.S. case *Keene Corp. v. Insurance Company of North America* (1981) was among the earliest appellate decisions to adopt a continuous approach, but other courts have applied the exposure trigger more narrowly, and the choice of theory varies by jurisdiction and even by the specific type of harm alleged. In the United Kingdom, the House of Lords decision in *Fairchild v. Glenhaven Funeral Services* (2002) and subsequent legislation addressed analogous issues in the [[Definition:Employers' liability insurance | employers' liability]] context, while courts across other common-law jurisdictions have developed their own approaches.

💡 The stakes for insurers are enormous. The choice of trigger theory determines how many policy periods — and therefore how many [[Definition:Policy limit | policy limits]] — are available to respond to mass tort liabilities, directly affecting the total insurance recovery and the allocation of loss among successive carriers. Under the exposure trigger, a larger number of insurers share the burden, which can be favorable for policyholders with long exposure histories but financially punishing for insurers that wrote coverage during peak exposure periods at low [[Definition:Premium | premiums]]. [[Definition:Reserving | Reserving]] for long-tail liabilities requires actuaries and claims professionals to model different trigger scenarios, and [[Definition:Reinsurance | reinsurance]] recoveries can hinge on which theory applies because reinsurance contracts often incorporate their own trigger and allocation provisions. For the global insurance market, trigger theory disputes remain a live issue as new categories of long-latency harm — including PFAS contamination and chronic workplace chemical exposures — generate fresh waves of litigation that test the boundaries of doctrines originally forged in the asbestos era.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Continuous trigger theory]]
* [[Definition:Manifestation trigger theory]]
* [[Definition:Long-tail liability]]
* [[Definition:Asbestos liability]]
* [[Definition:Liability insurance]]
* [[Definition:Occurrence]]
{{Div col end}}

Definition:Exposure trigger theory - Revision history

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