Code of Civil Procedure Article 320

A party may move the presiding judge to conduct a necessary examination of a witness or, after informing the presiding judge, conduct such examination himself/herself.The examination provided in the preceding paragraph may be directed to matters concerning the witness's credibility.In the examination provided in the two preceding paragraphs, the presiding judge may, on motion or its own initiative, limit or prohibit questions which are irrelevant to the disputed facts, repetitious, leading, insulting, or involving other inappropriate circumstances.The court shall rule on an objection raised with regard to the limitation placed on or prohibition of the examination.