Is a new trial required when other evidence corroborates a witness's testimony?

Does the fact that expert testimony may be available at trial require defense counsel to consult the experts or present their testimony at trial? (California, United States of America)

What is the test for admissible testimony at a civil trial of a witness giving evidence in a testimony that was not in the context of the trial? (California, United States of America)

Is a defendant's testimony at a previous trial admissible in evidence against him in a subsequent trial? (California, United States of America)

Is there any evidence that corroborates the allegedly corroborated testimony of a witness who was severely impeached? (California, United States of America)

In what circumstances of the crime scene evidence will be admitted during the penalty phase of a penalty trial, does the trial court error not to exclude the evidence? (California, United States of America)

When will a jury consider the credibility of a defendant's extrajudicial statements against trial testimony and the physical evidence and testimony of witnesses? (California, United States of America)

Does Defendant have a reciprocal obligation to disclose all relevant evidence obtained before trial, including rebuttal evidence it intends to use at trial? (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)

What is the nature of corroborative evidence required to support witness testimony? (California, United States of America)

Does the trial court abuse its discretion to exclude prejudicial evidence at trial? (California, United States of America)