Supreme Judicial Court, November 6, 2013

When a defendant is charged with operating under the influence of alcohol, at trial, an officer may offer an opinion as to the defendant’s level of sobriety or intoxication, but may not opine whether the defendant operate a motor vehicle while under the influence of alcohol or whether the defendant’s consumption of alcohol diminished his ability to operate a motor vehicle safely. 

An indictment may charge a crime without alleging all of the essential elements of proof, and due process does not require vacating a defendant’s conviction arising from his guilty plea where the defendant has fair notice of the crime charged and fails to show that he did not understand that he was pleading guilty to the crime.