California, United States of America
The following excerpt is from Booker v. America, A153835 (Cal. App. 2020):
"The substantial factor standard is a relatively broad one, requiring only that the contribution of the individual cause be more than negligible or theoretical." (Rutherford, supra, 16 Cal.4th at p. 978.) "Factors relevant to assessing whether such a medical probability exists include frequency of exposure, regularity of exposure and proximity of the asbestos product to [the plaintiff]." (Weber v. John Crane (2006) 143 Cal.App.4th 1433, 1438.)
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