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Definitions are presented in the order source books were published (most recent first).
Youth Criminal Justice Law, 3/e$60.00 – $96.00
It is a general rule of law that witnesses can testify only about what they observed, but an expert witness can express an opinion or draw a conclusion. There are certain matters about which even a layperson can express an opinion in court, such as whether another person was intoxicated or seemed tired.