What is the test for establishing "possible evidence to establish prima facie" of conspiracy?

presents 'independent evidence to establish prima facie the existence of . . . [a] conspiracy[,]'" and also substantiates "three preliminary facts . . .: '(1) that the declarant was participating in a conspiracy at the time of the declaration; (2) that the declaration was in furtherance of the objective of that conspiracy; and (3) that at the time of the declaration the party against whom the evidence is offered was participating or would later participate in the conspiracy.'" (People v. Hardy (1992) 2 Cal.4th 86, 139.)