Does a defendant have to rely on other federal or state law cases to support their claim for damages?

Does Defendant have a valid claim to be able to claim damages from a defendant who has been found guilty of a similar claim against the Defendant? (California, United States of America)

Is a claim for damages brought by defendant in a personal injury action brought by plaintiff against defendant in the Superior Court of Appeal against Defendant in a civil case? (California, United States of America)

Is there sufficient evidence to support a claim for lost income capacity damages in a case where the claim is for damages from a private practice that a plaintiff never opened? (California, United States of America)

Is there any case law in which a defendant has been ordered to produce a personal brief to support his claim for damages? (California, United States of America)

What is the test for a defendant's claim that the exclusion of evidence in the trial of a defendant in a sexual assault case violated his federal constitutional right to present a defense? (California, United States of America)

Is a new federal constitutional rule for the conduct of criminal prosecutions, like that of the Payne case, to apply retroactively to all cases, state or federal? (California, United States of America)

Can a federal and state prosecutor be found guilty of misconduct in a federal or federal criminal case? (California, United States of America)

Does Defendant have a claim that the trial court abused its discretion to treat Defendant as a "defendant" in a medical malpractice case? (California, United States of America)

Is there any case law supporting a defendant's claim that he deliberately struck another defendant in the head with a glass bottle? (California, United States of America)

Is there any case law in which a defendant has been successful in his claim for damages against a plaintiff in a civil case? (California, United States of America)