Ready For Trial

Are Portable Breath Tests Reliable?

October 31, 2018

Category: ,

I get a lot of questions about the portable breath tests. Police officers use these devices at roadside to see if a driver is “over the limit”. But are these devices even accurate?

These inexpensive devices are notoriously inaccurate and can over report your BAC greatly. There are a few reasons for this.

Issue #1: Residual Mouth Alcohol

One of the issues with the portable breath tests (PBTs) is that it is susceptible to over reporting due to “residual mouth alcohol”. This is the alcohol that is still in the mouth after a drink. The device will see that as a high concentration of alcohol and over report the BAC, even though that level of alcohol is not present in the blood. This is a big issue that is common with these devices.

Issue #2: They Detect other Forms of Alcohol

PBTs can’t tell the difference between ethanol and other chemicals that have similar properties. This is why if you were using a paint thinner, hand sanitizer, nail polish remover, mouthwash and many other substances, the PBTs can over report your BAC.

Issue #3: They are not Specific to Alcohol

Many common substances, which have no similarity to ethanol, can also cause an inflated BAC reading. There have been tests done that show even simple foods like white bread can cause a reading on these devices.

If you have recently been pulled over for OUI or DWI and believe the PBT showed an inflated reading, please call us now at (888) 526-9737. At Bowser law, we will examine your case and formulate a strategy to protect your rights. People who can’t afford a DUI trust Mike Bowser.

What is the Bowser Law Difference?

Mike Bowser has unique experience and knowledge which he uses to protect his clients.

  • Mike Bowser is the only Board Certified DUI Defense Specialist who practices in MA, NH & ME. This means he had to pass rigorous examinations and interviews about his knowledge of DUI law to become certified.
  • Clients who have hired Mike Bowser LOVE him! Take one look at his reviews and you will see why Mike Bowser is The Most Reviewed 5 Star DUI Defense Lawyer Practicing in MA, NH & ME!
  • He uses his deep understanding of forensic science to pick apart the evidence against you and looks for errors that he can challenge. He then carefully prepares your case with the goal of highlighting these issues and putting you in the best possible position.
  • He is a ruthless cross-examiner who is at home in the courtroom.Judges, prosecutors, and police officers often praise his professionalism and knowledge.

If you are facing a DUI charge, don’t delay. Call now to setup your
free, detailed consultation at

(888) 526-9737

25 years of Proven Personal Injury Results.

(888) 526-9737