What does DUI Professional do?
It turns drink timing, drink strength, body variables, absorption assumptions, elimination assumptions, and key case times into a documented BAC simulation.
Who is it built for?
The workflow is designed for attorneys, public defenders, forensic toxicologists, expert witnesses, law enforcement trainers, laboratories, alcohol educators, and legal education users.
What should users expect?
Users should expect structured modeling and report support, not a legal conclusion, impairment opinion, or substitute for qualified forensic testimony.
Practical scope
Practical BAC questions for professional review.
DUI Professional is most useful when the question is about timing and assumptions: what was consumed, when it was consumed, when the relevant event occurred, when testing occurred, and how alternate absorption or elimination assumptions affect the modeled BAC range.
Product basics
Product Scope
What DUI Professional is, who uses it, and where it fits in a professional workflow.
What is DUI Professional?
DUI Professional is web-based BAC simulation software for modeling alcohol consumption timelines, absorption, elimination, retrograde extrapolation, keypoint times, BAC ranges, and professional report output.
Who uses DUI Professional?
The platform is designed for DUI and criminal-defense attorneys, public defenders, forensic toxicologists, expert witnesses, law enforcement trainers, forensic laboratories, alcohol education programs, aviation safety educators, and legal education users.
How can DUI attorneys use BAC simulation?
Attorneys can compare a drinking history with the alleged driving time and later test time, evaluate rising-BAC questions, test alternate assumptions, and prepare focused questions for expert review or negotiation. The value is in organizing the timing and assumptions before drawing professional conclusions.
Is DUI Professional a one-number BAC calculator?
No. A single number can imply more precision than the facts support. DUI Professional is built around timeline modeling, expected BAC ranges, error assumptions, drink-entry detail, and reportable inputs so users can see how assumptions change the result.
BAC science
BAC Modeling
How absorption, elimination, retrograde extrapolation, and BAC ranges are handled.
What is retrograde extrapolation?
Retrograde extrapolation estimates a prior BAC from a later measured BAC by considering elapsed time, alcohol elimination, and whether the person was still absorbing alcohol. It is most meaningful when the drinking timeline, test time, and assumptions are documented clearly.
Can BAC continue to rise after drinking stops?
Yes. Alcohol can continue absorbing after the last drink, which means BAC may keep rising before it reaches a peak. That timing issue is central to rising-BAC analysis when the event time and test time are separated.
Why does DUI Professional show a BAC range?
A range helps reflect physiological variability and uncertainty in distribution, absorption, and elimination assumptions. The range makes it easier to compare best-case, midrange, and higher-bound assumptions without presenting a single value as certain.
What are optional BAC model simulations?
The standard Widmark workflow remains the default. Test/beta model options let users compare OSAC forensic range assumptions, Watson total body water, delayed absorption scenarios, and advanced research models when the necessary inputs and expert review support that comparison.
What factors affect a BAC simulation?
Common inputs include drink quantity, drink ABV, serving volume, drinking start and stop times, body weight, biological sex, food or absorption delay assumptions, elimination rate, and the time selected as the keypoint for analysis.
What is a keypoint time?
A keypoint is a user-selected time of interest, such as a traffic stop, crash, preflight check, workplace incident, or test collection time. The simulator reports modeled BAC values at that time so the chart is tied to the event being analyzed.
Expert Analysis
Expert Analytics
How model manuals, screenshots, instructions, and PDF manual output support transparent BAC model review.
What is Expert Analytics?
Expert Analytics is a public DUI Professional manual section that explains the Widmark, OSAC Forensic Range, Watson Total Body Water, Michaelis-Menten, and Norberg Two-Compartment model workflows in detail. Each page describes scientific background, simulator inputs, chart interpretation, report treatment, assumptions, limitations, and professional review considerations.
Are the Expert Analytics pages visible without logging in?
Yes. The Expert Analytics menu is visible to public visitors and authenticated users so attorneys, experts, evaluators, and training users can review the model documentation before opening a simulation or producing a report.
Do the model manuals replace expert testimony?
No. The manuals explain how DUI Professional applies assumption-dependent BAC simulations. They are not legal opinions, medical advice, court-approved calculations, or substitutes for qualified forensic testimony. They are designed to make the workflow more transparent and easier to audit.
Why are Michaelis-Menten and Norberg described as advanced models?
Those models are parameter-heavy research or expert-review models. They can be useful for low-BAC or pharmacokinetic sensitivity discussion, but the application must show their assumptions, units, source basis, warnings, and limits rather than treating them as ordinary default calculations.
How do the manuals relate to the BAC Model Annotation Appendix?
The manuals explain the model concepts before use. The BAC Model Annotation Appendix preserves the actual model selections, inputs, parameters, assumptions, warnings, literature basis, peak values, and keypoint values used in a specific exported simulation report.
Can an Expert Analytics page be exported as a PDF manual?
Yes. Each model page includes a PDF Manual control that generates a native iText PDF with DUI Pro-branded styling, embedded model figures, literature basis, professional-use warnings, and a copyright footer for 2026 Hopen Corporation.
Workflow
Simulation Workflow
How drink profiles, custom drinks, partial servings, saved work, and reports support repeat analysis.
How does the drink database help?
The drink database gives users reference entries with stored ABV, serving volume, type, and subtype information. Starting from a known profile reduces manual entry errors and helps the report describe the drink assumptions used in the BAC model.
Can users add custom drinks?
Yes. Users can add custom drink entries when a product, serving size, or ABV is not already represented. Custom entries let the simulation match case-specific facts instead of forcing every drink into a generic category.
Why do partial drink controls matter?
A person may consume a quarter, half, three-quarter, or full serving rather than an entire drink. Partial drink controls let users document that distinction and immediately see how the modeled BAC curve changes.
Can the drinking pattern be front-loaded or back-loaded?
Yes. The Drink Distribution control can assign individual start times and consumption lengths to each drink row. Users can drag drinks on a timeline, stack overlapping drinks, zoom for finer adjustment, or auto-distribute the drinks evenly when a linear assumption is preferred.
What is the Timing Model?
The Timing Model is the Drink Distribution workflow that lets each drink carry its own modeled start time and consumption duration. It is used when the facts or training scenario require more detail than an evenly pooled drinking period.
Do exact drink times remove assumptions?
No. Exact timing controls make the assumption explicit, but they do not prove that a drink was consumed at that minute. The user should document whether timing came from a witness statement, receipt, video time, client interview, training hypothetical, or another source.
Can simulations be saved and reopened?
Yes. Current DUI Professional simulations can preserve the subject variables, drink list, timeline, keypoint, notes, range settings, and related parameters so users can reopen and revise a scenario later.
What appears in the PDF report?
Reports are intended to document the inputs and modeled output: subject variables, drink profiles, consumption timing, keypoint values, BAC ranges, notes, chart output, and the assumptions used to produce the simulation.
What is the BAC Model Annotation Appendix?
When model comparison is used, the PDF can include an appendix that enumerates applied models, required inputs, parameter values, assumptions, warnings, and literature basis. It is intended for transparency and review, not as a claim that any modeled BAC is exact.
Access
Access and Professional Use
Evaluation access, subscriptions, legal-workflow use, and limits.
How do subscriptions work?
Users register first, verify access, and then select a subscription from the account area. The pricing page lists the available evaluation, annual, and monthly options shown by the application.
What is evaluation access?
Evaluation access allows users to explore the workflow before subscribing. Some simulation controls and report output may be restricted or marked for demo use until a subscription is active.
Can reports be used in legal work?
Reports can help organize assumptions and communicate analysis for attorney review, expert consultation, negotiation preparation, or training. Their use depends on local rules, case facts, professional judgment, and the role of qualified experts.
Does DUI Professional replace an expert witness?
No. DUI Professional supports analysis, education, and report preparation. Expert opinions, testimony, admissibility decisions, and case strategy remain the responsibility of qualified professionals and the court.
Is DUI Professional limited to DUI defense?
No. Although DUI case review is a primary workflow, the same BAC timing concepts can support law enforcement training, aviation safety education, workplace safety education, civil litigation review, and alcohol counseling scenarios.
DUI Professional does not determine guilt, impairment, admissibility, or the legal sufficiency of evidence. It is a structured BAC scenario-modeling and reporting tool. Case conclusions, expert opinions, and legal strategy should be made by qualified professionals using case-specific facts and jurisdiction-specific rules.
