Drivers often share tips they think can beat a driving while intoxicated (DWI) breath test. One of the most common is the penny trick. This myth claims that sucking on a penny before taking a breath test can lower your blood alcohol content. The idea likely started decades ago when people believed that the copper in pennies could interfere with how breathalyzers detect alcohol.
Why these myths still spread
The penny trick and other myths—such as using mouthwash or holding your breath—continue to spread because they sound simple and easy. Some stem from the way older breathalyzers worked. Modern technology, however, makes these tricks useless. Some can even make your breath alcohol test result higher. Mouthwash, for example, often contains alcohol and can lead to a false reading.
What modern science says
Most pennies today are not solid copper. They are mostly zinc and have a thin copper coating. Even if the metal could have an effect, it would not change how modern breath tests operate. Breathalyzers today utilize advanced technology, like fuel-cell sensors and infrared light. These tools check the alcohol deep in your lungs, not just what’s in your mouth.
How breath tests work
Fuel-cell sensors work by creating a chemical reaction with alcohol in your breath and measuring the electric current. Infrared machines use light to detect alcohol molecules. A penny in your mouth cannot block or change these readings.
What to do if pulled over
If an officer pulls you over on suspicion of DWI, do not panic. How you act in those first moments can affect what happens next. Officers watch you closely. Instead:
- Stay calm and respectful.
- Do not argue or try tricks to fool the breath test.
- Cooperate with the officer, but remember you have rights.
- You do not have to explain where you were or how much you drank. After the stop, write down everything you remember.
Details matter later. Even the smallest facts can significantly impact your defense. The court might look at when you took the test, what the officer said or how long you waited.
Protecting your rights
After the incident, consider talking to a lawyer. A skilled DWI attorney understands the science behind breath tests. They can review the facts of your case and protect your rights. Do not rely on myths or tricks. When it comes to DWI, knowledge and legal help make all the difference.