Impaired Driving Testing


To help assure road safety by certifying breath analysis instruments and law enforcement officers and by testing blood specimens obtained from motor vehicle operators arrested for Driving Under the Influence of Alcohol or Drugs (DUI/DUID).

What we do

  • Identify and quantify drugs and alcohol from blood specimens submitted by law enforcement agencies.
  • Train law enforcement officers in the areas of breath analysis instrument operation, relevant laws and regulations and operational protocols, and drug recognition in motor vehicle operators. Officers certified in 2020: 2,006; Number of breath instrument inspections completed: 1,042
  • Coordinate and maintain the National Highway Safety Administration’s Standard Field Sobriety Testing (SFST) instructional program.


  • Since 2008, the Forensic Toxicology Laboratory has maintained national accreditation to the ISO/IEC 17025:2005 standards by the ANSI-ASQ National Accreditation Board (ANAB). This laboratory was the first in New England to transition to the new and more rigorous ISO/IEC 17025:2017 standards.
  • •2020 data: Number of breath tests administered by law enforcement: 580; Average age: 35.4; Average blood or breath alcohol level: .168 (blood), .167 (breath); Number of impaired driving blood samples tested: 166; Percentage of cases positive for alcohol: 47%; Percentage of cases positive for drugs other than alcohol: 47.6%; Percentage of cases with ethanol or drugs: 94.6% Most commonly detected drugs in blood: 1. THC and/or metabolites:50% Narcotic analgesics/Opiates: 33% 3. Central nervous system stimulants (cocaines and amphetamines): 27% 4. Antidepressants/psychotics: 7% 5. Other Central nervous system depressants (sedatives, sleeping agents, muscle relaxants): 2%