After the Massachusetts Supreme Judicial Court decided the case of Commonwealth v. Gerhardt, many wondered how the Commonwealth would prove OUI Marijuana cases in Court. Charges involving OUI drugs, including marijuana are difficult to prove. However, these cases are still being prosecuted in the court.
The SJC in Gerhardt did not exclude field sobriety tests, now referred to as assessments from being offered into evidence in Court. It placed limitations on how this evidence can be presented to the jury and what its ultimate weight should be in assessing whether the Commonwealth has proven the case beyond a reasonable doubt. OUI marijuana cases will be prosecuted based on the observations of the driving, the field tests, admissions of the person consuming marijuana, the smell of marijuana, evidence of drugs found in the car.
This case was the first case to hold that field sobriety tests are not scientific tests of impairment by marijuana and that a jury should get a cautionary instruction when presented with this evidence. The Court also held that officers could not testify as lay witnesses that someone was impaired by marijuana.
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Massachusetts Criminal Defense Lawyer Blog


