Section 551.503 - Evidentiary burden(1) CIVIL. In a civil action or administrative proceeding under this chapter, a person claiming an exemption, exception, preemption, or exclusion has the burden to prove the applicability of the claim.(2) CRIMINAL. In a criminal proceeding under this chapter, a person claiming an exemption, exception, preemption, or exclusion has the burden of going forward with evidence of the claim.