How do I win an OUI Drugs Case in Massachusetts – Hire an attorney who knows. Today on Tuesday, 27 June 2023, DISMISSED: In Commonwealth of Massachusetts v. Defendant, Docket No. 2367 CR 0294, Charges of Operating Under the Influence of Drugs (OUI Drugs or Drugged Driving) against my client were DISMISSED on the date of trial.* It is difficult for the Prosecution to prove these charges at trial without a drug test of blood and expert testimony to interpret those tests before a jury. At a minimum the Commonwealth would need to present: (1) reliable evidence as to the amount or concentration of the drug in the defendant’s system; and (2) expert testimony indicating that the concentration of the drug in the defendant’s system would impair his or her ability to operate a motor vehicle. No Such evidence exists in most OUID cases.