8 C.F.R. § 1240.8 : Aliens and Nationality — EXECUTIVE OFFICE FOR IMMIGRATION REVIEW, DEPARTMENT OF JUSTICE — IMMIGRATION REGULATIONS — PROCEEDINGS TO DETERMINE REMOVABILITY OF ALIENS IN THE UNITED STATES — REMOVAL PROCEEDINGS — Burdens of proof in removal proceedings

(a) Deportable aliens. A respondent charged with deportability shall be found to be removable if the Service proves by clear and convincing evidence that the respondent is deportable as charged.
(b) Arriving aliens. In proceedings commenced upon a respondent's arrival in the Untied States or after the revocation or expiration of parole, the respondent must prove that he or she is clearly and beyond a doubt entitled to be admitted to the United States and is not inadmissible as charged.
(c) Aliens present in the United States without being admitted or paroled. In the case of a respondent charged as being in the United States without being admitted or paroled, the Service must first establish the alienage of the respondent. Once alienage has been established, unless the respondent demonstrates by clear and convincing evidence that he or she is lawfully in the United States pursuant to a prior admission, the respondent must prove that he or she is clearly and beyond a doubt entitled to be admitted to the United States and is not inadmissible as charged.
(d) Relief from removal. The respondent shall have the burden of establishing that he or she is eligible for any requested benefit or privilege and that it should be granted in the exercise of discretion. If the evidence indicates that one or more of the grounds for mandatory denial of the application for relief may apply, the alien shall have the burden of proving by a preponderance of the evidence that such grounds do not apply.

8 C.F.R. §1240.8