In Commonwealth v. Camblin, the SJC affirmed the denial of the defendant’s “motion to exclude [breathalyzer] evidence as scientifically unreliable” in the defendant’s trial for operating under the influence of alcohol.
The background was as follows. The defendant was charged “with operating a motor vehicle while under the influence of alcohol…. Before trial, the defendant moved to exclude admission of breath test evidence generated by the” breathalyzer utilized by the police, the Alcotest 7110 MK III-C (Alcotest). The judge denied the motion without conducting a Daubert–Lanigan hearing as to the scientific reliability of the Alcotest. The case proceeded to a jury trial at which the defendant was found “guilty of operating a motor vehicle while under the influence of alcohol and operating a motor vehicle with a blood alcohol level of or exceeding 0.08 per cent.” In response to the defendant’s direct appeal, in which he challenged the scientific reliability of the Alcotest, the SJC remanded the case to the trial court. On remand, the judge conducted a Daubert–Lanigan hearing, after which he “found that the Alcotest was capable of producing scientifically reliable breath test results, and denied the defendant’s motion to exclude this evidence at his trial.” In the present appeal, “[t]he defendant … contend[ed] that the judge abused his discretion in finding that the Alcotest satisfies the Daubert–Lanigan standard for the admissibility of scientific evidence.” The “focus of the defendant’s challenge … [was] that,” contrary to the judge’s finding, the Alcotest “cannot distinguish ethanol from other ‘interfering’ substances that might be present in a breath sample.” Continue reading →