Last updated April 2026
🚨 How DUI Cases Begin — and Where They Often Fall Apart
Every DUI case in Florida starts the same way: with a traffic stop.
But in many cases — especially in Broward County — the most important issue is not what happened after the stop. It’s whether the stop should have happened at all.
In fact, some of the strongest DUI defenses begin before any field sobriety tests or breath tests are ever conducted — by challenging whether the stop itself was lawful in the first place.
For a broader overview of DUI charges, penalties, and defense strategies, see our guide to DUI Defense in Florida.
If police lacked a valid legal basis to stop your vehicle, everything that follows — including arrest, testing, and statements — may be suppressed.
⚖️ What Justifies a DUI Traffic Stop in Florida?
Police cannot stop a driver based on a hunch.
To initiate a DUI stop, officers must have at least reasonable suspicion that:
- a traffic violation occurred, or
- the driver is impaired
Common justifications include:
- swerving or drifting between lanes
- speeding or erratic braking
- running a red light or stop sign
- nearly causing a crash
However, many DUI arrests occur without clear evidence of bad driving, which creates a major opportunity for defense.
In practice, officers often rely on vague or generalized observations — such as “weaving within the lane” — that may not meet the legal standard for a stop.
Many of these issues arise from officer error or weak observations — problems we break down in our guide to DUI Arrest Mistakes in Fort Lauderdale.
🧠 What This Means for Your Case
In many DUI cases, the legality of the traffic stop becomes the most important issue — even more important than breath test results or field sobriety exercises.
If the stop was unlawful:
- the arrest may be invalid
- the testing may be excluded
- key evidence may never reach the jury
In Broward County, many DUI cases are defended by focusing on what the officer did not have at the moment the stop was initiated.
👉 Not what they discovered later — but what they knew before activating their lights.
🚔 DUI Checkpoints and Roadblocks
Unlike typical traffic stops, DUI checkpoints allow police to stop drivers without individualized suspicion — but only under strict legal guidelines.
To be valid, checkpoints must:
- follow a neutral, pre-approved plan
- stop vehicles in a consistent pattern
- avoid arbitrary or discriminatory enforcement
If these requirements are not followed, the entire stop may be unconstitutional.
To better understand how roadblocks work and when they can be challenged, see our guide to DUI Checkpoints in Fort Lauderdale.
In many cases, checkpoint challenges focus not just on the existence of a plan, but on whether officers actually followed it in the field.
🧪 From Stop to Investigation: What Officers Look For
Once a vehicle is stopped, officers begin gathering evidence to justify a DUI arrest.
This often includes:
- odor of alcohol
- slurred speech
- bloodshot or watery eyes
- inconsistent statements
- admission of drinking
These observations are highly subjective — and often shaped after the fact to justify an arrest. In many DUI cases, the officer’s report is written after the arrest decision has already been made, which can lead to exaggerated or standardized descriptions of impairment.
Body camera footage frequently tells a different story than what is written in the police report. See how video evidence is used in Broward DUI Bodycam Footage.
In some cases, officers initiate or expand a DUI investigation based on the presence of alcohol in or around the vehicle — including situations involving open containers in parked cars or during casual encounters. See how these cases develop in Open Container Inside a Parked Vehicle in Florida.
⚠️ When DUI Stops Become Legally Problematic
Many DUI cases involve serious constitutional issues, including:
- stops without reasonable suspicion
- prolonged detention without justification
- searches conducted without consent or probable cause
- arrests based on weak or inconsistent observations
Search issues frequently arise after DUI arrests, as explained in our guide to
Can Police Search Your Car After a DUI Arrest in Florida?
These issues are especially important in cases involving crashes, including those discussed in DUI After an Accident (Not at Fault) in Florida.
Many of these constitutional issues are raised through a motion to suppress, which can result in critical evidence being excluded — or the case being dismissed entirely. These issues often connect directly to how DUI evidence is challenged — see our guide to DUI Testing and Evidence in Florida.
These issues often do not appear obvious on the surface — but become clear through careful review of bodycam footage, dispatch logs, and timing of events.
📊 Key DUI Investigation Issues in Florida (Where Cases Are Won or Lost)
Key DUI investigation issues include:
- DUI Checkpoints in Fort Lauderdale
- DUI Arrest Mistakes in Fort Lauderdale
- Can Police Search Your Car After a DUI Arrest in Florida?
- Broward DUI Bodycam Footage
- DUI After an Accident (Not at Fault) in Florida
These issues often determine whether a DUI case proceeds — or collapses early.
🛑 Why Early Defense Strategy Matters
DUI investigations move quickly — but the legal issues they create begin immediately.
By the time formal charges are filed, officers have already:
- documented observations
- collected statements
- conducted testing
- prepared reports for prosecutors
But early intervention allows a defense attorney to:
- challenge the legality of the stop
- preserve favorable evidence
- identify inconsistencies
- begin building suppression arguments
In many cases, the strongest defense is not about whether someone was impaired — but whether the police followed the law in the first place.
In many cases, early legal intervention is what prevents a weak stop from turning into a strong prosecution.
⚖️ Charged With DUI in Fort Lauderdale?
If you were stopped or arrested for DUI in Broward County or South Florida, the legality of the stop may be the most important issue in your case.
At Michael White, P.A., we approach DUI cases strategically from the outset — analyzing every stage of the investigation to identify weaknesses and opportunities for dismissal.
📞 Call (954) 270-0769 for a consultation today