Burden of proof and reliable evidence in CA9 granted. In part and remanded for further proceedings. The burden of proof is a legal standard that requires parties to provide evidence to demonstrate that a claim is valid. Three levels of this, “beyond a reasonable doubt,” a “preponderance of the proof,” and “clear and convincing” determine the level of proofs required for a claim. It is a party’s obligation to prove a charge, allegation, or defense. In the legal context, it plays a critical role in the success of a case.