What is the current state of the law on cross-examination?

examination designed to show a prototypical form of bias on the part of the witness, and thereby, 'to expose to the jury the facts from which jurors . . . could appropriately draw inferences relating to the reliability of the witness.' " [Citations.] However, not every restriction on a defendant's desired method of cross-examination is a constitutional violation. Within the confines of the confrontation clause, the trial court retains wide latitude in restricting cross-examination that is repetitive, prejudicial, confusing of the issues, or of marginal relevance. [Citations.] California law is in accord. [Citation.] Thus, unless the defendant can show that the prohibited cross-examination would have produced "a significantly different impression of [the witnesses'] credibility" [citation], the trial court's exercise of its discretion in this regard does not violate the Sixth Amendment.' " (People v. Virgil (2011) 51 Cal.4th 1210, 1251.)