The Supreme Judicial Court issued an opinion earlier this month, that held the common practice of eliciting opinion testimony from police officers regarding impairment in OUI cases is not permissible as evidence.This case is noteworthy, because in practice, many prosecutors have developed a habit of simply asking officers their opinion regarding whether a driver was impaired at the time of the arrest, which the court held is a legal issue upon which a lay witness is not qualified to speak.
The case involved the stop of a driver in 2009. In addition to recanting facts regarding the circumstances of the driver’s field sobriety tests, the prosecutor asked the officer whether he had formed any opinions regarding the driver’s sobriety. To this, the officer replied, “I believed that his ability to drive was diminished.” This is testimony that the court held was impermissible, as it comes close to an opinion on the ultimate issue of guilt or innocence, in this case the standard for the OUI charge is whether “the defendant’s consumption of alcohol diminished the defendant’s ability to operate a motor vehicle safely.” Therefore, due to the well established law that “[n]o witness, including a police witness, may testify as to a defendant’s guilt or innocence,” this type of testimony is not allowed.
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