Breath Test (Alco-Sensor) v. Chemical Test (Breathalyzer) 


Accidents happen because of drunk driving, and this why if there are some noticeable misbehaviors on the road, the police offer has the right to call for a traffic stop and interview the driver whom he thinks has misbehaved. Most of the police officers would try to assume that the driver is under the influence of alcohol and drugs, making it a potential offense for Drug Under Influence (DUI).  


Most of the drivers do not really know the whole process that involves in identifying if he/she is under the influence of alcohol or drug, and this is what Miami DUI lawyers are seeing when it comes to a number of issues on DUI cases.  This becomes a problem to the side of the accused because this creates a reason why the accuse refuse the second test, thus, he could be charged with a refusal to take tests to because of his lack of knowledge regarding the similarities and differences of these tests. 




There are instances that a police officer demands a traffic halt and a suspected is calledinto attention because they are suspected of driving while in intoxication with alcohol or drugs. The police officer would use equipment called Alco-Sensor Test to investigate by administering a breath-screening test. This test serves as a preliminary step to determine if the person has drunk some alcohol or not. However, this test is not completely reliable to identify the correct number of alcohol concentration in the person’s system by just taking a test from their breath. This is the very reason why Alco-Test result is never heavy proof that can be used at the court, and just use to help the police officer justify his DWI arrest of the driver.  


Once the driver has taken the Alco-test, resulted positive, and they are put into the precinct, the driver is then required to take a secondary test, which is the chemical test. This test involves the test of blood, breath, saliva, or urine and often use AlcoTest, Data Master, breathalyzer, Intoxilyzer, and more. These tests are able to determine the concentration level of alcohol and determine if the driver has exceeded to the legal BAC level. These tests are more reliable and therefore are often used during trials at court against or for the benefit of the accused.  


Since a great number of drivers do not know the similarities as well as the differences between the two tests, the become a bit aggressive when police officers asked them for a secondary test, which is the chemical test. Because of o this, some drivers refuse the chemical test. However, this becomes problematic as they can be subject to a “refusal” case and may experience some consequences because of this.  


This is why it is very imperative to have a clear understanding of the similarities and differences between the breath test and the secondary, chemical test to help the drivers make some informed decisions and prevent them from refusing the chemical test, which often provides them some negative results. However, in some cases, refusing the chemical test can also have a good result depending on the case and the severity of the offense they have committed.  


It is better to be fully informed about the DUI and/or DWI procedure system to avoid unnecessary repercussions.