What is the test for admitting evidence of third party involvement in the crime?

"To be admissible, the third-party evidence need not show 'substantial proof of a probability' that the third person committed the act; it need only be capable of raising a reasonable doubt of defendant's guilt. At the same time, we do not require that any evidence, however remote, must be admitted to show a third party's possible culpability. As this court observed in [People v. Mendez (1924) 193 Cal. 39], evidence of mere motive or opportunity to commit the crime in another person, without more, will not

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