When will evidence suggesting that a defendant has intimidated a witness be admissible to prove consciousness of guilt?

In People v. Williams (1997) 16 Cal.4th 153, 200, our high court summarized the general principles regarding when evidence suggesting the defendant has intimidated a witness is admissible to prove consciousness of guilt: " ' " 'Generally, evidence of the attempt of third persons to suppress testimony is inadmissible against a defendant where the effort did not occur in his presence. [Citation.] However, if the defendant has authorized the attempt of the third person to suppress testimony, evidence of such

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conduct is admissible against the defendant.' " ' [Citations.] In [People v. Terry (1962) 57 Cal.2d 538, 566], we held that proof of a criminal defendant's 'mere opportunity' to authorize a third person to attempt to influence a witness 'has no value as circumstantial evidence' that the defendant did so."