Commonwealth v. Guinan

Douglas F. Guinan appeals from convictions of motor vehicle homicide while under the influence of alcohol and operating a motor vehicle while under the influence of alcohol, causing serious bodily injury. See G. L. c. 90, § 24G(a); G. L. c. 90, § 24L(1). He contends that the trial judge abused his discretion in admitting, over objection, expert testimony ruling out the computer-assisted power steering mechanism of the defendant’s automobile as a cause of the collision. We conclude that the State trooper who offered this opinion lacked the qualifications to testify regarding the computer…