What is the test for admitting a witness' prior statement?

terms, is the test for admitting a witness' prior statement [citation], and the same principle governs the case of the forgetful witness.' [Citation.] When a witness's claim of lack of memory amounts to deliberate evasion, inconsistency is implied. [Citation.] As long as there is a reasonable basis in the record for concluding that the witness's 'I don't remember' statements are evasive and untruthful, admission of his or her prior statements is proper. [Citation.]" (People v. Johnson (1992) 3 Cal.4th 1183, 1219-1220.)