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Our DUI attorneys at CHM Law are often asked, what do you do if the blood results are over a .08, the legal limit in Arizona?  Fortunately, it is possible to manipulate a blood alcohol concentration (BAC) if your attorney is well-versed in the science.  Unfortunately, too many attorneys just plead their clients guilty because they do not understand how to move the blood alcohol concentration lower.

Inherent in a blood test is a 5% margin of error according to the prosecutor’s own expert witness.  However, our expert will testify that there is a 10% margin of error in the instrument.   This means the BAC can be 10% higher, lower, or anywhere in between the reported value.   The prosecutor has the burden of proving the case beyond a reasonable doubt.  Thus, the defendant gets the benefit of the doubt that the reading is 10% lower.

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How Can Blood Tests for BAC Readings be False?

One of the main factors that can lead to an inaccurate BAC reading after being pulled over for suspicion of DUI is that blood will clot. If the forensic scientist, who is testing the blood, sees the clot, he or she will grind the clot down so it does not artificially raise the reading.  However, the scientist will often never see the clot.

It is important to keep in mind that the prosecution’s crime lab does a whole blood analysis, which is clotty by nature.  Whereas, a hospital analysis for BAC is a plasma analysis.  Plasma is smooth and not clotty.  Whole blood is tantamount to orange juice with the pulp in it.

Any clotting within the blood sample can raise the reading dramatically.

Plasma is like orange juice without the pulp in it.  Therefore, whole blood is much more likely to clot than plasma.  The police blood storage tubes contain anticoagulants.  However, anticoagulant does not preclude clotting it only mitigates clotting.  Moreover, clotting occurs despite the anticoagulant.

Fermentation can also artificially raise a person’s BAC by creating alcohol in the person’s blood sample after it is removed from the body.

Fermentation occurs, in the sample, when there is food, sugar, for candida albicans to consume and the by-product is alcohol.  The reading is higher because alcohol is created in the sample.  However, that alcohol was not present in the person’s blood when he or she was driving.  The alcohol was created after the blood was removed from the body in the tube where it was stored.  The fermentation argument pairs well when there is Acetaldehyde in the blood.

Acetaldehyde is a chemical that is almost always present in the blood when a person has been drinking and shows up in the prosecutor’s blood results.  Acetaldehyde is a by-product of the body breaking down alcohol.  However, acetaldehyde is also a byproduct of fermentation.

Mistakes in drawing the blood can artificially raise the reading.

If a smaller gauge needle is used to draw the blood, it can shred the blood vessels and cause hemolysis.  Hemolysis can artificially raise the BAC.  If the blood is drawn from an artery instead of a vein this will artificially raise BAC.  The phlebotomist will often use hand sanitizer on their hands to sanitize their hands prior to the blood draw.  The main ingredient in most hand sanitizers is ethanol alcohol.  The same kind of alcohol the crime lab is testing for to determine BAC.  The phlebotomist will then grab the outside of the gloves with hands that have alcohol on them.  This puts alcohol on the outside of the gloves.   The phlebotomist then feels for the vein and then palpitates the vein.  The phlebotomist then puts the syringe into the arm, picking up the alcohol on the outside of the arm.

When the syringe is removed from the arm, it will have suction on it, and any evaporated alcohol from the hand sanitizer could be sucked into the syringe.  It is important to note that it would only take a microscopic amount of alcohol introduced into the syringe to have a profound effect on the BAC.

The above issues are assuming the instrument that measures the BAC is working correctly.  If the instrument is not working correctly, that is a separate strong defense in and of itself.  It is a mistake to assume the instrument is working correctly.  The prosecution must prove that it is working correctly.  If the instrument is working correctly, the above issues are ammunition to shoot at their case.

What about False Breathalyzer BAC Test Readings?

There is still a defense even if the breath test states that you are over the legal limit.  There are variables inherent in the breath test, also known as the breathalyzer or intoxilyzer, even when it is in perfect working order that can artificially raise the reading.  

The intoxilyzer has a 10% margin of error even when it is working perfectly.  The instrument can read 10% higher or lower or anywhere in between than the subject’s true alcohol concentration.

In addition to the 10% margin of error, an elevation in body temperature will cause the subject’s breath sample to be artificially higher. When a person wakes up from a full night’s sleep, they are almost a degree less than 98.6 degrees. However, at night time or early in the morning, before a person goes to sleep, their body temperature will be almost a degree higher than 98.6 degrees. This is the time that most people get charged with a DUI.  This slight elevation on body temperature of almost 1 degree can cause the reading to be artificially raised by 8.6%. 

Here is a logical example: If you put a cold cup of coffee in front of a person, they will smell it slightly.  However, if you put a hot, steaming cup of coffee in front of someone, it will have a stronger odor. As many people learned in school, heat expands. This is why the hot cup of coffee gives off a stronger smell. If the subject has a higher body temperature because they are sick and/or have a fever, the reading will be raised substantially higher.

A delay between inhalation and exhalation, which is required to blow properly into the breath test, will artificially raise the reading up to 15%. The reason for the delay in inhalation and exhalation is because the tube is not in the subject’s mouth when they take a deep breath. If it were, the subject could inhale the tube and choke on it.

The instrument assumes that your blood-to-breath conversion is 2100 to 1. However, 1 in 7 people are less than 2100 to 1, and this would artificially raise the reading.  Ironically, 7 people are the same amount of people that sit on a jury in a misdemeanor DUI in Arizona. When at trial, we always remind the jury that one of them would blow artificially higher on an intoxilyzer.  The amount the reading is raised depends on how much below the subject is to 2100 to 1 air to breath conversion ratio.  If a subject is 1900 to 1, the breath test results would be 10% higher.

It is important to keep in mind that all of these variables are still in effect even if the instrument is in perfect working order.

The variables are in addition to each other.  Therefore, if the breath test states that the subject’s breath test is a .125, their real body alcohol concentration can be as low as .07, which is below the legal limit.

Moreover, if the subject has a fever, the reading will be substantially higher.  In addition to the variables, there is always the possibility that the instrument is not working properly due to the instrument being out of tolerance, having stability or voltage problems, and radio frequency interferences.  If the instrument is not working correctly, a pretrial motion should be filed to suppress the breath test results, so the jury never hears the results. 

If the instrument is working properly, then the reading needs to be manipulated using the variables to show how the instrument can read artificially higher.  This provides the jury with reasonable doubt.  The jury is instructed by the judge that if they have reasonable doubt, they must find not guilty.   


When You Need Help from an Elite Arizona DUI Lawyer, Call CHM Law

If you need to move your blood and/or breath alcohol concentration below the legal limit, please call us at Colburn Hintze Maletta, PLLC (602) 825-2500.  We have successfully completed over 100 DUI jury trials and represented thousands of clients facing DUI charges. 

Our DUI defense tactics have proven to be so effective that we have taught continuing legal education to attorneys on how to manipulate breath and blood readings. That is how confident we are about winning your DUI case!

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Real Client Reviews

Below are just a few of what our clients have to say!

Arizona attorney Darin Colburn

“The calm in the middle of my storm…”

I, recently, consulted with Darin after my wife filed for divorce. He was referred to me by a friend whom I very much trust. Darin was the antithesis of the first two attorneys I consulted (who were matter-of-fact and had very little empathy about the fact that I was struggling emotionally with what was transpiring). From the first few minutes of speaking with Darin, it was obvious that he was very knowledgeable and skilled with divorce and family matters. While that was most important to me, the thing that made the difference was his calming, logical, and empathetic approach. He took the time to listen and empathize with me. He took the time to understand what I wanted to achieve through this process and laid out my options. After the consultation, I knew he would be my attorney if I had to pull the trigger. I, ultimately, didn’t have to engage Darin’s services due to a reconciliation with my wife. I hope I never have to go through that process again, however, if I do, I know beyond a shadow of a doubt who I will be hiring to represent me…Darin R. Colburn. Darin, thank you for caring and being more than an attorney.

Frank - AVVO Review

Divorce / Reconciliation Client
Attorney David Maletta

“There is NOBODY I would rather have defending me than David”

I hired David Maletta and it was the best decision of my life. His knowledge, genuine interest, overall attitude, and ability to connect with people is incomparable. I could talk about all of this at length. I COULD do all of that, but that wouldn’t do David justice. He first and foremost demonstrates his interest and genuine care for his client. Being in uncharted territory with a criminal charge and nowhere to turn, David’s presence and personality put all nerves at ease. I went through a jury trial with David beside me. The trial ran for 3 days and I spent a significant amount of time with David one-on-one. During this stressful time, he wanted to hear my input and thoughts on everything. David was incredible from the first day I met him. Not only is he a great attorney, but he is also a great person who cares about people and finding justice for his clients. He connects to the human side of people. I can’t put into words how much David cares about the individual in a case. When it comes to the courtroom, there is NOBODY I would rather have defending me than David.

Jacob - AVVO Review

DUI Defense Client
Arizona attorney Darin Colburn

“Because of Darin I got my daughter back”

Before I hired Darin I went through a total of 3 different attorneys in two different states fighting a jurisdiction battle, when my daughter was taken to a different state. It was a very difficult decision to switch attorneys at one of the most difficult, time sensitive and important times in my case, but I’m very glad I did. Upon receiving my file from previous attorneys Darin came very familiar with my case quickly. Like other people have explained he took the time to lay everything out and explain how the process was going to proceed and what to expect and continued to do this as new issues arrived. He is also very quick at responding to emails and phone calls. My case was getting close to trial as told by my previous attorneys, I did not want to go to trial as I know this is very costly (most attorneys will convince you that you need to.) Darin knew my situation, fought for what was right and got the results I wanted while avoiding a costly trial. He is extremely knowledgeable in the Child Support Guidelines as well. Because of Darin I got my daughter back. I would highly recommend him and would hire again for any future issues. Thanks Darin!

Chris - AVVO Review

Child Custody & Support Client
Attorney David Maletta

“I was found NOT GUILTY. Dave won the trial for me.”

Dave stayed with me while he pushed back and forth with Covid-19 and the delays with court. Once cited, the state basically decides that you’re guilty through the automatic suspension of your drivers license. Dave immediately took care of that problem and I never lost the privilege of driving. Dave took notes like crazy and was upfront about our uphill battle. I was also well aware that the plea deal that was given to us, was unacceptable and through Dave’s knowledge and experience I had put my trust in him to guide me to make the right decision on how to proceed. With Dave’s guidance I had decided that we needed to fight for something better than what the prosecutor was offering and Dave was 100 percent behind me on that decision. We knew the risks, be we also knew we had very little to lose based on the prosecutions stance. We decided to go to trial… Watching the prosecution and then watching Dave was night and day!! It was clear to the jury that the prosecution didn’t have their facts straight and were not addressing the facts that they could not address…There was a lot at stake for my personal life and my work life. I was found NOT GUILTY. Dave won the trial for me.

Gregory - AVVO Review

Criminal Defense Client
Arizona Attorney Timothy Hintze

“Tim was absolutely amazing and worked diligently”

I had an incident and was Given the catch-all charge. There wasn’t really anything I could do by myself to get out of it. Tim was absolutely amazing and worked diligently to ensure that I would have the best possible outcome from my case. Which he successfully achieved! As of right now I am on the path to having my case fully dismissed. A couple things that really helped me through this process was that Tim did an amazing job at was answering my questions. He was available almost anytime and would respond promptly when he got my emails. He was also very approachable and comforting to be around while we had in person meetings and especially when I was at the court house. I would trust him and the company he works for with any other cases in the future and as of right now they will be my first choice if I need a lawyer in the future.

Dylan - AVVO Review

Criminal Defense Client
Arizona Attorney Timothy Hintze

“Listens to every request that you make on a case”

I honestly just want to let it be known to any and everyone looking for an attorney on a case. Whether it be DUI, possession, or your every day to day traffic violations where you need representation attorney Tim Hintze is your man. You have to respect a man that listens to every request that you make on a case and he gets in there and gets it done. Tim has my respect as an attorney and being a well-rounded representer. From him being honest on the possibility and options for your case to him being easy to work and communicate with via over the phone or face to face Mr. Hintze is working it out.

Ben - AVVO Review

Criminal Defense Client
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