English translation: or have available a witness with knowledge
Login or register (free and only takes a few minutes) to participate in this question.
You will also have access to many other tools and opportunities designed for those who have language-related jobs (or are passionate about them). Participation is free and the site has a strict confidentiality policy.
Explanation: Mira a ver si alguna de estas definiciones encaja en tu contexto... Yo me quedo con "character witness".
character witness n. a person who testifies in a trial on behalf of a person (usually a criminal defendant) as to that person's good ethical qualities and morality both by the personal knowledge of the witness and the person's reputation in the community. Such testimony is primarily relevant when the party's honesty or morality is an issue, particularly in most criminal cases and civil cases such as fraud.
credible witness n. a witness whose testimony is more than likely to be true based on his/her experience, knowledge, training and appearance of honesty and forthrightness, as well as common human experience. This is subjective in that the trier of fact (judge or jury) may be influenced by the demeanor of the witness or other factors. (See: credibility)