Skip to Content
SCHEDULE YOUR CONSULTATION TODAY! 562-330-4173
Top

Driving Symptoms

The first type of evidence that will be presented to the jury by the prosecution will be the arresting officer’s observations of the defendant’s erratic or otherwise unusual driving symptoms—what attracted the officer’s attention in the first place. In the rare case where the officer witness did not observe driving, such as where there has been an accident, then that portion of the corpus delicti will be supplied by lay witnesses or by circumstantial inference.

How important are the driving symptoms in a DUI case? 

Most DUI defense attorneys would probably consider the blood-alcohol evidence to be the most critical, followed perhaps by field sobriety tests. But many experienced prosecutors believe that the most important area in obtaining a conviction is police testimony concerning the defendant’s driving.

A manual prepared by one of the largest prosecuting agencies in California recognizes four major categories of evidence: driving symptoms; appearance and demeanor; FSTs; and blood-alcohol test or refusal. Of these, the manual states, driving is the most important—and field sobriety tests, “which are not generally viewed by jurors as highly persuasive,” the least.

While the author does not necessarily agree with this view, it may be helpful to understand what the view of one’s opponent may be.

Call our DUI lawyer at (562) 330-4173 to schedule a free consultation.

How does the DUI lawyer deal with testimony of damning driving symptoms?

Typically damning testimony would involve the officer initially observing the defendant’s car traveling at a high rate of speed. For example: as the officer began pursuit, the officer noticed that the car weaved across lane lines on five occasions; at one point, the defendant failed to stop for pedestrians who were crossing in an intersection. When the officer finally decided to turn on his flashing red lights, the defendant failed to pull over for a quarter of a mile; when he did, he parked at an odd angle to the curb, the rear of his car presenting a hazard to passing traffic.

 Each case is different, of course, but engaging in a frontal attack on the officer is rarely productive—to premise a defense on the sole theory that the officer is a liar and is trying to hang your client for some unknown reason. The usually more effective approach is to take each observation, one at a time, and suggest reasonable explanations for the observed conduct—and thus, a reasonable explanation for why the officer believed (mistakenly) that the client was intoxicated.

DUI Driving Symptoms

The following list of DUI driving symptoms, from a publication issued by the National Highway Traffic Safety Administration (DOT HS-805-711), is widely used in training officers to detect drunk drivers on the roads.  After each symptom is a percentage figure which, according to NHTSA, indicates the chances that a driver is under the influence of alcohol.  For example, NHTSA’s research indicates that “the chances are 65 out of 100” that a driver who is straddling a center or lane marker has a blood-alcohol concentration of .10% or higher (the pre-.08% standard).

Turning with wide radius     65
Straddling center or lane marker     65
Appearing to be drunk     60
Almost striking object or vehicle     60
Weaving     60
Driving on other than designated roadway     55
Swerving     55
Slow speed (more than 10mph below limit)     50
Stopping (without cause) in traffic lane     50
Drifting     50
Following too closely     45
Tires on center or land marker     45
Braking erratically     45
Driving into opposing or crossing traffic     45
Signalling inconsistent with driving actions     40
Stopping inappropriately (other than in lane)     35
Turning abruptly or illegally     35
Accelerating or decelerating rapidly     30
Headlights off     30

Just to renforce this as a mathematical science thoroughly impressive to juries, NHTSA further claims — and officers are taught — that there is also a quick-and-easy formula for multiple symptoms:  “When two or more cues are seen, add 10 to the highest value among the cues observed”.

Of course, if these suspiciously precise figures are to be believed, then almost half of the folks who tailgate you every day are drunk — and almost half of the time you don’t brake smoothly you are, too.  Further, only 60% of drivers “appearing to be drunk” to the officer actually are. (Query:  How does a driver “appear to be drunk” to an officer following 100 feet behind? Slurred speech?  Alcohol on his breath?)  And speeding — one of the most common reasons for pulling DUI suspects over — is not even on the list. 

Call us at (562) 330-4173 to schedule a free consultation with an experienced DUI attorney near you.

    "Won DMV hearing and got my case expunged for a minor issue"

    Truly great team of lawyers. Handled everything the very best they could. Won DMV hearing and got my case expunged for a minor issue, so no record, as it should be! Can definitely rely on them.

    Nick T.
    "Christopher always made me aware of what was going on with my hearings, and got me the best outcome possible."

    When you need to get a lawyer, you aren't usually in a great situation. I wasn't at least.  Christopher and his team never made me feel ashamed, they just help me get through a situation where sh*t happens. Christopher always made me aware of what was going on with my hearings, and got me the best outcome possible. He made things easy to understand, helped with the paperwork, and I while I *hope* to not have to seek his services again, I would highly recommend him and his team for anyone needing a lawyer!

    Jessica S.
    "This is a top level law firm. The Bible of DUI's comes from this firm!"

    This is a top level law firm. The Bible of DUI's comes from this firm! These are the guys other attorneys call when they are stuck on a legal issue or need some guidance. There is no other firm or DUI attorney that has the kind of experience these folks do. I have practiced for a long time, and can tell you that when these guys walk into court the clients will fair 1000% better! Most attorneys do not have trial experience, and if your case must go that direction it's scary to see non experienced dui attorneys walking in with no experience.  NOT these guys. Chris Taylor is one of the best trial attorneys I have ever seen; and a force to be reckoned with.  The folks I have recommended have had nothing short of positive experiences. A DUI is nothing short of stressful, and can have such an impact on a persons life between restricted or no driving privileges, classes, the cost, and the general stress of it all. This law firm handles all of these issues with such ease, and most important you know you are the most well represented client in any court or DMV hearing

    Tania C.
    "Thankfully Mr. Taylor was able to help fight my case without me ever having to go to court"

    You should never drink and drive anywhere, but especially don't do it in la Jolla! Cops down here have nothing better to do then make your life miserable. It is also a college town which adds assault to injury. I should take my own advice because I was recently arrested for a DUI down in La Jolla. A friend of mine referred me to Mr. Taylor's office and I am extremely glad I got into contact with them. I hardly blew over the legal limit and did perfectly fine on the sobriety tests but still was arrested. Thankfully Mr. Taylor was able to help fight my case without me ever having to go to court and I was able to have the charges dropped. Extremely professional law firm with the experience to get you the results you want.

    Steven K.
    "I have come across many attorneys in my life and I have never been treated as well as I have her"

    I have come across many attorneys in my life and I have never been treated as well as I have here. Every phone call was returned in a timely and courteous manner. The first consultation was very professional, and my attorney Chris patiently answered every question I had. In situations like this, responsiveness is key and this firm never left me feeling uninformed. I was very satisfied with the outcome of my case and would definitely recommend this firm to anyone in need of a DUI defense attorney.

    Anthony D.
    "I would recommend this firm with no qualms!"

    I received counsel in a sensitive legal matter from Lawrence Taylor Sr., and his advice was spot on. I did some research and I also know that the senior Mr. Taylor is in the top echelon in his field. He has written text books on DUI and he has taught the topic in law school.  I would recommend this firm with no qualms!

    Jerry S.
    "Jeanne Normandeau is a great lawyer. She knows how the Riverside court judges work."

    Jeanne Normandeau is a great lawyer. She knows how the Riverside court judges work. She will fight for you and will get you the best results after fighting with the judge and DA. She is honest and smart. Never had any problems, answers all questions and is always easy to contact. If you have the money, I recommend Jeanne. The public defender and judge will offer you the worst deal you can get.

    Joe E.
    "They will fight strategically to help you win your case."

    These are the best lawyers in LA/OC when it comes to DUI cases. They will fight strategically to help you win your case. My Attoney Chris Taylor was impeccable in many aspects; one he interrogated the officer causing him to fumble with his initial statement; two he is well respected within the courtroom; three he keeps you well informed with everything he is doing and what you may need to do. I can't be more pleased with the outcome of his performance. Thank you God for Taylor and Taylor!

    Kendall L.
    "Mrs. Normandeau is by far the hardest-working and most diligent attorney I have ever met."

    I cannot express enough gratitude towards Taylor and Taylor's Attorney, Jeanne Normandeau. I hired Mrs. Normandeau for a VERY messy DUI case. Not only did she approach it with the utmost professionalism, but also displayed a level of empathy that is unmatched in this profession.

    Mrs. Normandeau is by far the hardest-working and most diligent attorney I have ever met. She could be reached if I ever needed to get ahold of her, whether it be email, call, or text. Not only was she available but was willing to talk about any questions I had or work through any legal issues. Mrs. Normandeau's unrelenting work, extensive preparation, and tireless advocacy were instrumental in successfully dismissing my case.

    Bruce R.
    "Chris not only got me down to a Wet Reckless but was able to significantly reduce the penalties I would face."

    Im am so glad that I read the reviews of Taylor and Taylor after my first "incident" and immediately contacted them.  Chris was great at calming my nerves as this was my 1st offense and at a .06 it was right on the line on a trial or pleading it out.  Chris not only got me down to a Wet Reckless but was able to significantly reduce the penalties I would face.  His whole office staff was also very helpful and he returned my calls when I had questions if not the same day, the next. I plan on having my record expunged and will be going back to him for that.  He attended all DMV and court hearings on my behalf which took A LOT of stress off me.  I strongly recommend him.

    Suzi J.

Speeding

Consider first the officer’s testimony that the defendant was speeding. One tactic is to ask the officer how many speeding tickets he has issued in his career—and how many of those involved drunk driving. The answer to this last question should be “none,” since an officer arresting someone for drunk driving rarely bothers to issue a speeding citation as well. But this simple line of questions presents issues which can later be developed in arguments to the jury.

  • If speeding is symptomatic of drunk driving, why has the officer never found speeding to be involved in any of his DUI arrests?
  • If speeding is not a symptom, then why was the officer attempting to present it as evidence of intoxication?
  • If the defendant was speeding, why wasn’t he cited for it?

DUI attorneys must, obviously, keep a tight rein on the officer during cross-examination and not permit the officer to offer explanations. If the subject is not explained in redirect, then the issue should be discussed during argument.

Evidence of speeding can be turned to the client’s advantage. This involved leading the DUI officer to admit that controlling a car requires more coordination and greater judgment as speed increases. Quite simply, driving a vehicle at the speed observed by the officer without having an accident requires considerably greater reflexes, coordination, and judgment than at the legal speed. Thus, the very fact of speeding without mishap is evidence of sobriety. In other words, rather than trying to prove the client was not speeding, counsel should simply accept the fact and turn it to his advantage. The natural tendency of the trial lawyer to contest everything should be overcome; the client is not on trial for speeding.

The Results of Our Cases Speak for Themselves

Providing Hard-Hitting Criminal Defense
  • Felony DUI w/ Injury

    Rancho Cucamonga - 18 months prison, loss of license.

    Reduced to Misdemeanor DUI (fine, no jail)
  • Drunk Driving

    Los Angeles - 6 months jail, fine, license suspension

    Reduced to Exhibition of Speed (fine)
  • Drunk Driving w/ Drugs

    Glendale - 6 months jail, fine, license suspension.

    Charges Dismissed
  • DUI & Hit-And-Run (.30%)

    Vista - 1-year jail, fine, license suspension.

    DUI Dismissed, Plea to Hit-and-Run (Fine)
  • 2nd Offense DUI At High Speed

    Ventura - 1-year jail, fine, loss of license.

    Charges Dismissed

Weaving

The next driving symptom almost universally encountered in DUI cases is “weaving.” In fact, along with “alcoholic breath,” “thick and slurred speech,” and “bloodshot eyes,” it seems nearly a prerequisite to any arrest for drunk driving. And, without question, there are officers who will add these symptoms to their reports to create the classic DUI scenario. In most cases, however, the officer is honest—but guilty of suggestive perception: once he has decided that the suspect is possibly under the influence, he expects to see the usual symptoms —and normal inattentive driving becomes “weaving.”

DUI lawyers must develop through cross-examination of the officer that weaving is not nearly as unusual or symptomatic of intoxication as it sounds. The officer should be led to admit that no driver steers a car in a geometrically straight line dead center in the lane; only railroad cars travel perfectly straight. During argument, the jurors should be reminded that even the most sober of them will find that as one drives, one is constantly, perhaps subconsciously, correcting course with a back-and-forth steering wheel motion. So it is a matter of degree—and of the car's mechanical condition.

The mechanical condition of the client’s car at the time of arrest should not be overlooked in preparing for trial. A thorough inspection by a licensed mechanic may well produce a valuable defense witness, since mechanical problems can cause weaving and other erratic driving symptoms. Testimony that the car had bent tie rods, a sticking accelerator, defective suspension, worn brakes, faulty steering, improperly inflated tires, or poor wheel alignment, can be effective. Even without such a witness, the possibility of such mechanical problems can be brought out in cross-examination of the officer.

Continue Reading Read Less
Orange County's Premier DUI Defense Attorneys

With an average of 32 years of experience, a top A-V rating, and a listing in the Bar Register of Preeminent Lawyers, the firm continues to be widely recognized as California’s premier DUI defense attorney's and has twice been recognized in the American Bar Association Journal for its specialization and unique technical support staff of former law enforcement, blood-alcohol and DMV experts.

Defendant’s Failure to
Pull Over

The officer’s next observation may involve the client’s failure to pull over after the siren or flashing red lights were activated. Once again, the tactic of the DUI lawyer is not to disprove that this happened, but rather to offer a reasonable explanation. For example, it is not unusual, and thus not evidence of inebriation, to be unaware of flashing lights to the rear, particularly during daylight hours. If the client saw the lights, they may have assumed that they were intended for someone else — not an unreasonable assumption for someone who believes they have done nothing wrong. Or the client may have reasonably believed that it was an emergency and they were to get out of the way (which the officer will see as more weaving or an unsafe lane change). If the siren was then used, counsel should develop the increasingly common problem familiar to officers, firefighters, and ambulance drivers, of motorists being oblivious to sirens because of air conditioning and car stereo systems. With the windows rolled up, the air conditioner on and the stereo blaring through large door-mounted speakers, it is hardly a surprise that many drivers do not hear sirens.

  • We Wrote the Book on DUI Defense
  • Former County of Orange Attorney & Former LA Deputy District Attorney
  • Highly Respected by Peers and Clients
  • Only Law Firm Approved by California State Bar to Offer Continuing Legal Education
  • 1st Law Firm in CA to Specialize in DUI Defense
  • Featured Twice in American Bar Association Journal for Specialization in DUI

Manner of Pulling Over

The DUI officer may testify that when the client did finally pull over, the client parked at a dangerous angle to the curb—indicating the poor judgment and coordination of the drunk driver. It can also indicate, however, a very nervous and frightened driver. The officer should be asked if they have observed this type of parking in cases involving routine traffic citations and if it is common for drivers who are pulled over to be flustered and apprehensive. With blood pressure rising and adrenaline pumping, totally sober drivers have been known to cause traffic accidents under such circumstances. If the officer chooses to deny this, jurors who have been pulled over may begin to doubt his entire testimony; few jurors would react coolly and dispassionately to being pulled out of traffic with flashing lights and sirens.

The DUI attorney should not limit the inquiry to what the officer has testified they observed: counsel should also bring out what the officer did not observe. Some experience with DUI cases is helpful here. The officer can be asked if alternately speeding up and then slowing down can be a symptom of drunk driving — or, in the alternative, if the officer has seen such driving in past DUI cases. If so, did the officer observe this type of driving with the defendant? Was the defendant going off on the shoulder of the road? Was the defendant obstructing traffic by traveling too slowly? Did the defendant run any red lights? Did the defendant cause any other cars to swerve to avoid them? What the officer did not observe can be as relevant to the issue of inebriation as what the officer did observe.

The Law Offices Of Taylor & Taylor is here to help. Call (562) 330-4173or contact us online today if you have any further questions about driving symptoms as they relate to DUI.

Tailored Defense For You

Whether you have questions or you’re ready to get started, our legal team is ready to help. Complete our form below or call us at (562) 330-4173.

  • Please enter your first name.
  • Please enter your last name.
  • Please enter your phone number.
    This isn't a valid phone number.
  • Please enter your email address.
    This isn't a valid email address.
  • Please make a selection.
  • Please enter a message.
  • By submitting, you agree to be contacted about your request & other information using automated technology. Message frequency varies. Msg & data rates may apply. Text STOP to cancel. Acceptable Use Policy