For years, law enforcement officers in Massachusetts and across the country have relied on breath tests to determine an approximation of a driver’s blood alcohol content (BAC). These devices typically consist of a tube that is connected to a small machine. When an officer believes that a driver is under the influence of alcohol, the officer can ask the driver to take a breath test. If the test result indicates that the driver’s BAC is greater than .08, they can be arrested and charged with driving under the influence.
The use of breath alcohol tests is extremely prevalent. However, the use of breath alcohol testing devices can raise several legal issues in Boston DUI cases. One of the major limitations of breath testing machines, from a law enforcement perspective, is that they currently only test for alcohol. However, some jurisdictions have begun working on breath testing machines that could also be used to test for narcotics, such as marijuana, cocaine, or heroin.
Massachusetts law provides that all drivers must take a breath alcohol test when a police officer makes such a request. However, being required to take a breath test along the side of the road is an intrusion into drivers’ privacy interests. Thus, officers must base their request for a driver to take a test on articulable facts supporting a belief that the driver is intoxicated. If an officer is unable to point to any evidence suggesting that the motorist was drunk, the test results may need to be excluded. Of course, this introduces an element of subjectivity into the mix because an officer’s observations that a driver was “acting drunk” are rarely captured on video. This raises the issue of police officer credibility, especially when a motorist recalls a vastly different series of events leading up to their arrest.