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

What is the current state of the law on credibility of witnesses in a witness trial? (California, United States of America)

What is the current state of the law on the right of a witness not to confront a defendant in a witness box? (California, United States of America)

What are the principles of a motion for a new trial where a witness in a murder trial later dies before the trial has even begun? (California, United States of America)

Can a defendant who does not have a written waiver allowing him to attend the criminal trial of a witness be present at the trial of the witness? (California, United States of America)

Can a witness be admitted as a witness at a preliminary hearing where the witness is in a state hospital? (California, United States of America)

Is a defendant's claim that the trial court's failure to provide him with the means and subpoena witnesses to defend at trial a violation of his Sixth Amendment right to represent himself at trial reversible? (California, United States of America)

When a defendant makes a mid-trial motion to revoke his self represented status and have standby counsel appointed for the remainder of the trial, does the trial court have a duty to manage the trial? (California, United States of America)

When a witness at the preliminary hearing is unable to testify at trial, can the former witness be used at trial? (California, United States of America)

What is the current state of the federal and state constitutions governing the trial of a criminal defendant who is mentally incompetent? (California, United States of America)

Does a deputy district attorney acquiesce in having the motion heard during the trial of a defendant before trial, rather than prior to trial? (California, United States of America)