The Florida DUI Trial Manual

The Science Floor

Never concede that the liver clears alcohol at a fixed rate no matter what. A constant rate is the premise the State’s retrograde extrapolation needs, because only a straight line runs backward with arithmetic. Concede it and you have handed the State its model and called it science.

Measurement Uncertainty as a Legal Concept

Do not present the published inspection uncertainty as if it were the whole interval. It is measured on known reference samples in the laboratory, so it is only the floor. Pull the figure for the specific instrument and the relevant concentration, then have a qualified expert widen it for what a real subject test adds: the observation period, breath temperature, sample volume, the assumed blood-to-breath ratio, contamination, interferents, and radio interference. Near the limit, that added width is the part that reaches below the line.

The Machine’s Own Records

When you cross on the Volume Not Met episode, do not argue your client was one of the 181. Argue what the timeline proves about the system: the defect rode in the evidentiary software for more than a year, the Department’s own validation had tested the volume function and passed it, and a defense lawyer, not the machine, caught it. That makes the machine’s acceptance of a sample a claim the State must defend, not a fact beyond question.

Headspace Gas Chromatography

Ask for the raw chromatogram and the peak-integration codes, never just the one-line report. Rule 11D-8.011(2)(f) commands the procedure to discriminate among methanol, ethanol, acetone, and isopropanol and to employ an internal standard, so a valley-to-valley or baseline-to-valley edge drawn on the ethanol peak is a documented reason to ask whether this run met that floor. Read the rule for what it says, though: it names those four compounds and requires the internal standard; it does not require a second column, and telling a judge otherwise hands the State an easy correction.

Auditing the Lab

Make the analyst build the budget out loud, not just recite a plus-or-minus. Ask which Type B sources were counted, the certified value of the reference material, the calibration and drift of the balance and the pipette, the instability of the sample, because a budget that counts only the laboratory’s own day-to-day scatter has left out the doubt that rides in on its standards and instruments, and has undercounted the uncertainty it reports.

The Standardized Field Sobriety Tests

Frame the battery in limine before the officer takes the stand. Under Meador the psychomotor exercises come in only as lay observation, so move to bar the words test, pass, fail, points, and score, and to require a full scientific predicate before the HGN test reaches the jury. Win that motion and the officer has to describe what he saw in plain language, without the vocabulary that makes an artificial exercise sound like a validated measurement.

The DRE Protocol, Taken Apart

In Florida the evaluation is admitted, so build the case around weight and discovery, not a motion to exclude the whole procedure. The clean vehicle is a reliability challenge under section 90.702, Florida Statutes: the controlling case that admitted the evaluation predates Florida’s move to that standard, so a hearing supported by the validation record and a qualified expert asks a question no Florida appellate court has yet reached.

Cross of the Blood Analyst

One fact controls this run: whether the tube was in date when the blood went in. Pull the tube’s lot number and expiration date from discovery, along with the storage and handling records; where the tube was expired, or the file cannot show it was not, the concession is simply that nothing in the number confirms the preservative was still guarding the sample.

Jury Selection

The relief that a not-guilty verdict does not call the officer a liar, because an honest officer can still be wrong, is worth planting here and spending again in closing. A juror who has already agreed to it in voir dire can doubt the number later without feeling he is accusing anyone of dishonesty.

Appendix G, Objections and Opening the Door

When the State cries open door, make it name the door. Ask the court to require the prosecutor to identify, on the record, the specific piece of defense evidence that was itself inadmissible or misleading, and to do so before any bad-acts or character material reaches the jury. A bias fact, a prior inconsistent statement, or a procedure the analyst cannot deny was admissible in the first place, so it opens nothing. Put that on the record and the section 90.404 and section 90.610 limits stay where they belong.

Appendix H, Formal Review Forms

Cut two checks, not one. The formal-review request on HSMV 78065 carries a twenty-five-dollar fee payable to DDL; the restricted-license application on HSMV 78306 carries a twelve-dollar fee payable to the Division of Motorist Services. Two forms, two amounts, two payees: a single check or the wrong payee leaves an application incomplete, and the Department treats a review as not requested until its fee is paid. Pay each fee with its own filing and keep dated proof of both, because a clock the Department says never started is a clock you cannot enforce.