在秘密调查这一极为特殊的情况下，证人的身份可不予披露。在证人保护方面，卢森堡与其他国家进一步开展合作。鉴于卢森堡是个小国，该国并未设立任何正式的证人保护方案。
The non-disclosure of the identity of a witness is possible in the very special case of covert investigation. Luxembourg further cooperates with other States in the field of witness protection. Given the small size of the country, there are no formal witness protection programmes in Luxembourg.