Yes, but the subpoena occurs due to evidence that minutes contain elements crucial for deciding the case. The trustee may also disclose trust information if it will exonerate the trust and its trustees. Whether trust information (e.g. trust minutes, trust indenture, schedules) is required due to subpoena or by voluntary submission, the proceeding occurs 'in camera' (privately in judge's chambers). This guarantees the privacy of all parties is protected and only exposed for the minute moment of making judgement.