Short answer: Sometimes. It depends heavily on which court your case is assigned to, and on a decision you have to make before you ever enter a plea. In roughly half of Collin County’s misdemeanor courts, a judge will waive the interlock when the right groundwork is laid. In the others, the judge generally won’t, and the smarter move may be a different kind of plea altogether. Denton County is stricter still. Here’s how I actually walk a client through it.
I’m Justin Wilson. Before I started defending DWIs, I spent three years prosecuting them at the Collin County District Attorney’s Office. Texas first allowed deferred adjudication for Class B DWIs for arrests on or after September 1, 2019, and between Collin County’s filing backlog and the COVID court shutdowns, we began entering these pleas here in late 2020. I’ve now watched how these courts handle the interlock question on hundreds of cases. That pattern is the whole game, and most people facing a DWI have no idea it exists.
(This page covers one specific lever. For the bigger picture, from the jail to the courtroom, see my full guide to defending a criminal case in Collin County.)
The Real Decision: Deferred Adjudication vs. a Class B Conviction
On a Class B DWI, you’re usually weighing two paths, and the interlock sits right in the middle of them:
- Deferred adjudication probation. You don’t get convicted. If you complete your terms cleanly, you can petition for early release at roughly the halfway point, and you become eligible to seal the case with an order of nondisclosure after a waiting period, meaning you can truthfully say you were not convicted. The catch: depending on your court, deferred adjudication may come with an ignition interlock requirement.
- A Class B conviction with probation. Texas law does not require an interlock as a condition here. But there’s a real cost. On a DWI conviction probation, you serve every single day of the term. There is no early release from probation.
So the trade is rarely “good vs. bad.” It’s often no conviction but an interlock versus no interlock but a conviction. Which one wins depends on the court you’re in and on what’s happening in your life. More on that below.
How an Interlock Waiver Actually Works (the One Move That Matters)
Under Texas Code of Criminal Procedure Art. 42A.408(e-2), a judge has discretion to waive the interlock on a DWI deferred if the defendant completes a controlled substance and alcohol evaluation before entering the plea, and, based on that evaluation, the judge determines and enters in the record that restricting the defendant to an ignition interlock is not necessary for the safety of the community. We present the completed evaluation to the judge at the plea, the judge reviews it, and if the requirements are met, the judge may waive the interlock.
That single step, getting the evaluation done before the plea rather than after, is the lever the whole outcome turns on. A few things I’ve learned matter enormously here:
- Use a county-approved evaluator. Some offer the evaluation by phone, which is convenient, but the important thing is that the evaluator is one the court will accept.
- Have your attorney review the completed evaluation before it’s ever submitted. What the report says matters, and the wrong evaluation handed up to a judge can do more harm than good. This is not a formality to rush.
- In some courts, the prosecutor’s notation controls. At least one Collin County court follows what the State writes on the plea paperwork, so part of my job is getting the prosecutor to affirmatively note that the State does not object if the court chooses to waive the interlock.
How Collin County Courts Actually Handle It
This is where local experience is everything. In my experience, about half of Collin County’s misdemeanor courts will consistently waive the interlock when the evaluation supports it, and the other half generally will not, no matter how well-prepared you are. The courts that waive do so reliably; the courts that don’t, don’t.
That consistency is good news, because it means the strategy is knowable in advance:
- If your case is in a court that waives: in most situations, deferred adjudication is the easy call. You get the shot at early release, no conviction, and the path to a nondisclosure.
- If your case is in a court that won’t waive: I often tell clients they may not need to rush into the pre-plea evaluation at all (unless it helps some other condition of probation), because it won’t change the interlock outcome. Instead, the real conversation becomes: would you rather have an interlock and no conviction, or no interlock and a conviction?
How I Help a Client Make That Call
When the interlock can’t be waived, the decision usually turns on what’s happening in the client’s life:
- Applying for a new job soon? Deferred adjudication usually wins. Being able to say you weren’t convicted is worth living with the interlock for a while.
- Job involves driving clients in your vehicle, or a lot of out-of-state travel? A conviction with no interlock is often the better fit, because the interlock itself would interfere with your livelihood.
There’s no universal right answer, and that’s the point. The right answer depends on your court and your circumstances, which is exactly why this is a conversation to have with someone who knows both.
Denton County Is a Different Animal
If your DWI is in Denton County, set your expectations differently. Denton’s misdemeanor courts almost never waive the interlock. I’ve seen it happen once, in the early days. You may still earn an early release, but you should plan on having the interlock.
Two local nuances worth knowing:
- One Denton court will consider it on the back end. That court will let a defendant try to avoid the interlock by passing a hair-follicle test for alcohol after the plea. The plea paperwork requires the interlock be installed within 30 days; if the test (which looks back about 90 days) comes back clean before that deadline, the interlock comes off the table. If it’s positive for alcohol or another substance, the interlock stays.
- A possible alternative charge. In some cases, Denton County’s DA office will consider reducing a DWI to a charge such as Obstruction of a Highway, which can allow deferred adjudication without an interlock. This depends entirely on the facts and the prosecutor’s discretion. It isn’t available in every case, but it’s an option I always evaluate.
The Interlock Mistake I See Most Often
If you do end up with an interlock, here’s the trap that catches good people: you have some drinks on a night you’re not driving, you feel fine the next morning, and you get in the car, not realizing how long alcohol actually takes to clear your system. The device reads a positive, and now you have a violation on a case you were handling perfectly. If you’re on an interlock, give yourself far more time than you think you need before you drive.
Frequently Asked Questions About DWI Interlocks in Collin and Denton County
Is an ignition interlock mandatory on a Collin County DWI?
Not always. On deferred adjudication, a judge has discretion under Art. 42A.408(e-2) to waive it if a pre-plea controlled substance and alcohol evaluation supports a finding that the interlock is not necessary for the safety of the community. Roughly half of Collin County’s misdemeanor courts grant that waiver and half do not. On a Class B conviction, Texas law doesn’t require an interlock at all.
Does completing a substance-abuse evaluation early really help?
It’s the key step. The evaluation has to be completed before the plea and has to support the waiver. Done right, in the right court, it’s what gives the judge the basis to waive the interlock.
Should I take deferred adjudication or a conviction to avoid the interlock?
It depends on your court and your life. Deferred means no conviction and possible early release, but maybe an interlock. A conviction means no interlock, but no early release from probation. If you’re job-hunting, deferred usually wins. If your work depends on driving, a conviction with no interlock may be better.
Can I get the interlock removed early?
Possibly, on either path. On deferred adjudication, completing your conditions with no violations often lets you petition for early release from probation at about the halfway point, and the interlock comes off with it. On a conviction, you must serve the full probation term, but if an interlock was imposed as a condition, you can file a motion to modify, and the judge has discretion to remove the interlock early without ending probation early. So early interlock removal is possible on both paths; only the early release from probation is unique to deferred adjudication.
How is Denton County different from Collin County on interlocks?
Denton’s misdemeanor courts almost never waive the interlock up front. One court will consider removing it if you pass a post-plea hair-follicle alcohol test within the deadline, and in some cases the DA may consider an alternative charge that avoids the interlock entirely.
Talk to a Lawyer Who Knows These Courts
Which court your DWI lands in changes everything about this decision, and the most important move (the pre-plea evaluation) has to happen early. If you’re facing a DWI in Collin or Denton County, let’s talk before any decisions get made. Free consultation: call 214-764-5535, or reach our Frisco DWI defense team serving Collin and Denton County through our contact page. Learn more about our Collin County criminal defense practice.
This article describes general patterns from my experience. It is not legal advice or a guarantee of any result, and every case turns on its own facts and the court involved.
