Peak Alcohol Levels
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DUI
Peak Alcohol Levels
- Absorption Rate
- Alcohol Absorption
- BUI
- Challenging DUI Evidence
- DMV Hearings
- Driver's License Restoration
- DUI Penalties
- DUI with Injury
- Facing a DUI Conviction?
- Felony DUI
- First Time GUI
- Unlawful Police Stops
- Underage DUI
- Vehicular Manslaughter
- Multiple Offense DUI
- Drug DUI
- Aggravated DUI
No Charges Aggravated Assault
ALLEGATION: Client arrested for drive-by shooting and was facing the possibility of a minimum mandatory 15 year prison sentence under Florida’s 10-20-Life Law. RESULT: After consulting with with prosecutors and law enforcement NO CHARGES WERE FILED.
Negotiated Plea DUI Manslaughter
ALLEGATION: Client charged with DUI Manslaughter. Client faced up to 15 years prison and a permanent loss of his drivers’ license. RESULT: Client entered negotiated plea to probation and is eligible to drive with a hardship license.
Not Convicted Sexual Battery
ALLEGATION: Client who holds a professional certification and license with the State of Florida was accused of Sexual Battery with the possibility of 15 years prison and mandatory “Sexual Offender” designation. Arrest was reported in the Panama City News Herald. RESULT: Charge reduced without consent of victim to simple battery (misdemeanor). Client NOT CONVICTED of any criminal offense and not designated a Sexual Offender. Client able to return to work without loss of professional certification and license
Client NOT CONVICTED Violation of Probation
ALLEGATION: Client violated probation for a second time by failing to report (“absconding”), committing a new crime of Battery, not completing DUI school and failing to complete court ordered community service hours.
Not Convicted Violation of Probation
ALLEGATION: Client violated probation by failing to report (“absconding”) and committing a new felony of Obtaining a Controlled Substance by Forgery. Client was on probation for 7 counts of Obtaining a Controlled Substance by Fraud, 6 counts of Forgery, and 6 counts of Criminal Use of Personal Identification.
Peak Alcohol Levels
Why the Timing of Your BAC Test Is a Legal Issue
One of the most important — and most frequently misunderstood — scientific facts in DUI cases is that blood alcohol concentration does not peak the moment you finish your last drink. Alcohol continues to be absorbed from the stomach and small intestine into the bloodstream for anywhere from 30 minutes to 2 hours after consumption, depending on individual factors. This means your BAC may still be rising at the time of a traffic stop, and the reading from a breathalyser administered 30, 60, or 90 minutes after you stopped driving may be higher than your BAC actually was while you were on the road.
Rusty Shepard is a Nationally Ranked Superior DUI Attorney (NADD 2014–15), listed among the Top 100 DUI Attorneys in Northern Florida, and a former Assistant State Attorney. He has reviewed the science behind alcohol absorption, retrograde extrapolation, and breathalyser evidence in Bay County DUI cases for over 25 years.
Factors That Affect When BAC Peaks
- Food intake — eating before or during drinking slows gastric emptying, significantly delaying alcohol absorption and lowering the peak BAC reading. A person who drank on an empty stomach will reach peak BAC faster and at a higher level than a person who ate the same amount of alcohol with a meal.
- Body weight and composition — alcohol distributes into body water, not fat. A person with more body water (typically higher body weight and male physiology) will have a lower BAC from the same alcohol consumption than a lighter person.
- Sex-based differences — women generally produce lower quantities of alcohol dehydrogenase, the enzyme responsible for initial alcohol metabolism in the stomach. This leads to higher and longer-lasting BAC compared to men consuming the same amount.
- Rate of consumption — drinks consumed rapidly result in a faster and higher BAC peak than the same quantity consumed slowly over several hours.
- Carbonation — carbonated mixers (soda, sparkling wine) accelerate gastric emptying, causing alcohol to be absorbed more quickly and BAC to peak sooner.
Retrograde Extrapolation — The Prosecution's Calculation and How to Challenge It
When a significant amount of time passes between a DUI stop and the breath or blood test, prosecutors sometimes attempt to calculate what the defendant’s BAC must have been at the time of driving — a process called retrograde extrapolation. This involves working backwards from the test result using an assumed elimination rate for alcohol.
Retrograde extrapolation is highly contestable. The accuracy of the calculation depends on knowing exactly when the defendant stopped drinking, their personal elimination rate (which varies significantly between individuals and cannot be reliably assumed), the timing and content of their last meal, and whether they were in the absorption or elimination phase at the time of testing. Rusty Shepard challenges retrograde extrapolation evidence by attacking the assumptions underlying the prosecution’s calculation and presenting evidence of the specific variables — food, timing, individual physiology — that undermine the claimed BAC at the time of driving.
The Intoxilyzer 8000 — Florida's Approved Breathalyser
Florida uses the Intoxilyzer 8000 as its approved breath testing instrument. Accuracy of the Intoxilyzer 8000 result depends on:
- Operator certification — the officer administering the test must hold current certification. Lapsed or expired certification is grounds for suppression.
- Instrument inspection and calibration — the device must be inspected on a regular schedule using certified reference solutions. Inspection records are discoverable.
- Observation period — Florida requires a 20-minute observation period before the breath test to prevent mouth alcohol contamination from burping, belching, or recent drinking. Failure to maintain this observation is grounds to challenge the result.
- Mouth alcohol — residual alcohol in the mouth from dental work, acid reflux, or recent drinking can produce falsely elevated results that do not reflect true BAC.
- Partition ratio variation — the Intoxilyzer 8000 converts a breath sample to a blood alcohol equivalent using a standard 2100:1 partition ratio. Individuals with lower partition ratios will be overrepresented by the device.
Rusty Shepard requests all Intoxilyzer 8000 inspection records, operator certification records, and observation logs in every DUI case where breath evidence is used.
Charged with DUI in Panama City or Bay County? The breathalyser result is not the end of the case. Call Shepard Law at (850) 290-2505. NADD Superior DUI Attorney. Former ASA. Free consultation. Available 24/7.
DUI
Peak Alcohol Levels
- Absorption Rate
- Alcohol Absorption
- BUI
- Challenging DUI Evidence
- DMV Hearings
- Driver's License Restoration
- DUI Penalties
- DUI with Injury
- Facing a DUI Conviction?
- Felony DUI
- First Time GUI
- Unlawful Police Stops
- Underage DUI
- Vehicular Manslaughter
- Multiple Offense DUI
- Drug DUI
- Aggravated DUI
No Charges Aggravated Assault
ALLEGATION: Client arrested for drive-by shooting and was facing the possibility of a minimum mandatory 15 year prison sentence under Florida’s 10-20-Life Law. RESULT: After consulting with with prosecutors and law enforcement NO CHARGES WERE FILED.
Negotiated Plea DUI Manslaughter
ALLEGATION: Client charged with DUI Manslaughter. Client faced up to 15 years prison and a permanent loss of his drivers’ license. RESULT: Client entered negotiated plea to probation and is eligible to drive with a hardship license.
Not Convicted Sexual Battery
ALLEGATION: Client who holds a professional certification and license with the State of Florida was accused of Sexual Battery with the possibility of 15 years prison and mandatory “Sexual Offender” designation. Arrest was reported in the Panama City News Herald. RESULT: Charge reduced without consent of victim to simple battery (misdemeanor). Client NOT CONVICTED of any criminal offense and not designated a Sexual Offender. Client able to return to work without loss of professional certification and license
Client NOT CONVICTED Violation of Probation
ALLEGATION: Client violated probation for a second time by failing to report (“absconding”), committing a new crime of Battery, not completing DUI school and failing to complete court ordered community service hours.
Not Convicted Violation of Probation
ALLEGATION: Client violated probation by failing to report (“absconding”) and committing a new felony of Obtaining a Controlled Substance by Forgery. Client was on probation for 7 counts of Obtaining a Controlled Substance by Fraud, 6 counts of Forgery, and 6 counts of Criminal Use of Personal Identification.
What Sets Shepard Law Apart?
Your case is our priority. We aim for the best outcome.
We understand the complexities of the legal system and the impact on your life. Our focus is on securing your future.
CLIENT FEEDBACK
Our clients’ voices matter. Read about real cases and the positive outcomes achieved with our legal guidance.
Personable and understanding
“Rusty is very personable and accommodating. He made himself available on short notice and met with me after hours. He told me not to worry and got everything dismissed in court this morning! Thank you Rusty and Lisa!!!”
– Lauren
Sweetest, kindest, most Professional #1
“Mr. Shepard and his staff are amazing! They went above and beyond to help me. I would not want anyone else on my team! I am young and despite that, he made sure that the judge saw me as a person and not just a young person. He and his office even spent extra time with me and attended to every single thousand question that I had. They could not get a better rating 10 stars!!”
– Jessica
Absolutely Recommend
“Shepard Law is truly one of a kind!!! Their team of attorneys and support staff knows criminal law inside and out. They will take a case to trial with no fear and are a force to be seen in the courtroom!!!! They are compassionate and make their clients feel supported every single step of the way. They are flexible with payment options, which allows everyone to be able to receive TOP QUALITY representation. I would absolutely recommend Shepherd Law to any of my friends or family members without hesitation.”
– Vanessa M.
Under a time line!!!
“My wife and I found out on a Monday that we needed a Defense Attorney on Tuesday for a family situation. I called the office and Megan quickly contacted Rusty and he reassured us that he would be at court on Tuesday and he would take care of everything. Those words were the most comforting we’ve heard as this came up not long after Hurricane Michael. Rusty and his office has no idea how much he helped us and how much we appreciate their quick response. Thank you will never cover how much you guys mean to us.”
– Craig E.
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