Can a defendant be held liable for his or her actions or inaction in a motor vehicle accident?

37, p. 243.) "[A]s long as the jury finds that without the [particular] act [or omission] the [result] would not have occurred when it did, it need not determine which of the concurrent causes was the principal or primary cause of [the result]." (People v. Catlin (2001) 26 Cal.4th 81, 155.) However, a defendant cannot be held liable for his or her conduct or inaction if the part it played "'"was so infinitesimal or so theoretical that it cannot properly be regarded as a substantial factor in bringing about the particular result."' [Citations.]" (Ibid., italics omitted.)