If you are facing a DUI charge in Wisconsin (either OWI or PAC), avoiding a conviction will involve preventing the prosecutor’s office from meeting its burden of proof. While prosecutors must prove your guilt beyond a reasonable doubt, they may be able to use several forms of evidence to do so—and facing a conviction is a genuine concern.
So, how can you prevent prosecutors from meeting their burden of proof? One option is to keep key evidence out of court. If prosecutors can’t use their evidence against you, they won’t be able to prove that you were operating while intoxicated at the time of your arrest.
5 Key Types of Evidence (and How to Keep Them Out of Your DUI Case)
With this in mind, here are five key types of evidence in Wisconsin DUI cases, as well as some of the options that are available for keeping each type out of court:
1. Breathalyzer Test Results
Prosecutors in Wisconsin have two ways to secure a DUI conviction—they can prove that either (i) the defendant was operating a vehicle while intoxicated (OWI) or (ii) the defendant had a prohibited alcohol concentration (PAC).
Police officers use the breathalyzer device to test DUI suspects’ blood alcohol concentration (BAC) on the side of the road. If your BAC is above the legal limit, you can be charged with PAC regardless of your actual level of impairment. As a result, your BAC reading is a powerful piece of evidence, and if you took the breathalyzer and blew over the legal limit, you must challenge your BAC reading by all means available.
How can you challenge your breathalyzer test result? There are several potential ways to question the accuracy and reliability of your BAC reading. The options that you have available will depend on the specific facts of your case. If the breathalyzer wasn’t correctly calibrated, if the officer didn’t properly administer the test, or if you have an alternate explanation for your high BAC, these are all issues—among others—that could provide a solid defense for your PAC charge.
2. Field Sobriety Test (FST) Results
Even if prosecutors can’t rely on your BAC, they may still be able to secure an OWI conviction by proving that you were driving while intoxicated. Your field sobriety test (FST) results could be critical evidence.
The FSTs are used to prove alcohol impairment. Each of the three tests—the one-leg stand test, the walk-and-turn test, and the horizontal gaze nystagmus test—is designed to assess the effects of alcohol consumption. If you “failed” the FSTs during your traffic stop, you can be almost sure that prosecutors will try to use this against you.
How can you challenge your FST results? While the FSTs are commonly used as evidence in OWI cases, they are notoriously unreliable. As a result, an experienced DUI defense lawyer may be able to challenge the admissibility of your FST results on various grounds.
3. Police Video Footage
Police in Wisconsin use both dash cameras and body-worn cameras to record their traffic stops and interactions with DUI suspects. If your traffic stop or arrest was caught on video—and if the footage suggests that you were driving under the influence—you can expect prosecutors to try to use this against you as well.
As expected, video footage can also be robust evidence in DUI cases. Suppose prosecutors show the judge or jury footage of you driving erratically or stumbling on the side of the road. In that case, this can weigh heavily in favor of a conviction unless you can raise issues with the footage.
How can you challenge police video footage? While video footage may not have the same reliability issues as breathalyzer and FST results, there are still various issues your lawyer may be able to raise in your defense. Is there an alternate explanation for your “erratic” driving? Did you slip or stumble because of the condition of the road? Is the prosecutor’s office only showing an (unfavorable) portion of the footage? If the footage simply indicates that you might have been drunk, this is not enough to warrant a conviction.
4. Police Officer Testimony
Police officer testimony plays a crucial role in many DUI cases. If your arresting officer is prepared to testify that you smelled of alcohol, that your eyes were bloodshot, or that you exhibited other clear signs of impairment, this could provide the prosecution with a strong case against you.
How can you challenge your arresting officer’s testimony? Here, too, there are several potential options. Is the officer really sure that you were drunk? Or is he or she making assumptions? Did the officer follow all the necessary protocols for making an arrest based on “failed” FSTs? Or is it possible that he or she skipped over the required procedures? Remember, you don’t necessarily need to prove that you are innocent. It would be best to prevent the prosecution from proving you are guilty. Raising issues that create a reasonable doubt could be enough to avoid a “Guilty” verdict at trial.
5. Your Admissions
If you admitted to drinking and driving on the side of the road, this can also provide the prosecution with a strong case against you. Prosecutors relish the opportunity to use defendants’ own words against them, and admissions will often lead to convictions (or plea deals).
How can you challenge your own admissions? One option may be to assert your constitutional rights. If the police interrogated you in custody without reading your Miranda rights, this could render your admission inadmissible in court. Another option is to raise issues with your admission itself. Even if you thought you were drunk, this doesn’t necessarily mean that you were actually “render[ed] . . . incapable of safely driving.” Wisconsin’s DUI laws are incredibly complex, and you should not let any assumptions or misunderstandings lead to an unwarranted conviction.
Discuss Your Case with a Madison DUI Defense Lawyer for Free
If you need to know more about the options for keeping key evidence out of your Wisconsin DUI case, we encourage you to contact us promptly. To request a free consultation with a Madison DUI defense lawyer at Mays Law Office, call 608-291-7609 or get in touch online now.