According to the authors, an investigator who testifies in court can avoid giving ambiguous answers by

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Performing a careful pretrial review of crime scene notes, sketches, photographs, and case reports can help ensure that the investigator is fully prepared and knowledgeable about the case, thus allowing them to give clear and unambiguous answers in court. Reading directly from prepared notes can come across as rehearsed and may not allow for flexibility in responding to unexpected questions. Refusing to answer questions or providing as little information as possible may be seen as unhelpful, evasive, or suspicious.

According to the Authors, an Investigator Who Testifies in Court