In proceedings for challenge of an arbitrator pursuant to Article 815 of the Code of Civil Procedure, the challenging party bears the burden of proving the facts underlying the challenge, mere allegation of the circumstances that should justify the challenge being insufficient.
In proceedings for challenge of an arbitrator, testimony by persons having a direct interest in the arbitral dispute that is the subject of the proceedings is inadmissible, the principles of Article 246 of the Code of Civil Procedure regarding testimonial incapacity of interested parties applying by analogy.
Improper anticipation of the judgment through declarations that manifest a definitive and preconceived assessment of the elements that are the subject of the arbitral decision constitutes grounds for challenge of an arbitrator pursuant to Article 815, paragraph 1, No. 6-bis of the Code of Civil Procedure.