Drunk and drugged driving are often seen as essentially the same. For example, December is National Drunk and Drugged Driving Prevention Month. That makes sense in that they are similar in many ways. But they’re also very different in many important ways.

One is that drunk driving continues to drop. But drugged driving is rapidly rising. One reason may be that it’s much easier to be arrested for DUI than for drugged driving.

I. Drunk Driving.

Both drunk and drugged driving are commonly viewed as impaired driving. Of course, drunk driving is usually impaired driving. Yet a number of alcoholics show no signs of impairment while legally intoxicated. That is, with a blood alcohol concentration (BAC) of 0.08% or even much higher.

On the other hand, some drivers are impaired with a BAC below 0.08%. That’s why they can be arrested in many states for drunk driving even with a legal BAC. And that’s logical. But the law says that a BAC of 0.08% or higher is per se illegal. That is, that it is in and of itself illegal. It presumes and arbitrarily creates illegality. So evidence that the driver was not impaired is not admitted in court..

For police, it’s a “heads I win, tails you lose.” That’s good for them. But it’s bad for the innocent, unimpaired driver.

Many people find that trade-off acceptable. That may be because people in general highly stigmatize (as they should) drunk driving.

On the other hand, drugged driving receives little attention. In fact, Monthers Against Drunk Driving (MADD) strongly opposed giving any attention to drugged driving. And it did so for decades.

II. Drugged Driving

Driving drugged is a lot more complicated. Alcohol is alcohol. In fact, the amount of pure alcohol is equivalent in standard drinks of beer, wine, and spirits (liquor). It’s six-tents of one ounce.

But there are dozens of drugs. Some are prescription drugs. Others are illegal. Many can impair driving ability. Some can improve it. A positive drug can often neutralize a negative one. And none can have any effect at low enough amounts.

As with alcohol, drugs can effect different people in different ways. And at different levels.

Amphetamine

This drug can improve some driving skills. For instance, it can improve concentration, increase alertness, and improve divided attention. It can also increase the energy of tired drivers.

On the other hand, it can cause tunnel vision, poor impulse control, irritability, and paranoia. This can lead to aggressive driving.

Amphetamine improve psychomotor skills of sleep-deprived drivers. But its effects on thinking abilities are inconsistent.

Cannabis (Marijuana)

Marijuana contains a substances called THC. It appears to cause most of the psychoactive effects of cannabis.

At usual recreational levels, cannabis effects many driving skills. They include drowsiness, reduced and poor coordination, poor concentration, and difficulty thinking. As well as distorted perceptions of time and space, disorientation, paranoia, and reduced inhibitions.

Many things influence the specific effects of any given level of THC in the blood. These include the user’s experience and expectations about the effects. Also very important is the setting in which it’s used.

The effects of cannabis mostly disappear within three to five hours. But some of the effects last for as long as 24 hours.

Focusing on the important while disregarding the unimportant is an important skill for safe driving. Long-term users have more trouble doing this. They also process information at a slower speed.

The use of marijuana along with alcohol may cause much greater impairment than either substance alone.

Carisoprodol and Meprobamate

These drugs, carisoprodol and meprobamate, are both central nervous system depressants. The former is prescribed as a muscle relaxant. The latter is for reducing anxiety.

Either of these drugs can reduce visual ability, slow thinking and cause confusion. They can also cause sluggishness, tremors, and poor coordination.

The use of any other central nervous system depressant can increase the effects. For instance, alcohol can increase the sedation and confusion that carisoprodol can cause. It can also increase the sleepiness, confusion, and incoherence that meprobamate can cause.

Cocaine

This drug stimulates the central nervous system. It can increase alertness, reduce fatigue, and improve mental focus and clarity. It also improves the performance of some simple tasks, creates euphoria, and creates feelings of well-being and strength.

At higher doses, cocaine might cause confusion, disorientation, aggression, hallucinations, and other problems.

But some researchers find no effect on thinking or psychomotor skills. Still others report that cocaine improves attention, learning, and psychomotor skills.

Cocaine reduces the negative effects of sleep deprivation or alcohol intoxication.

Dextromethorphan

Dextromethorphan is an over-the-counter drug for coughs.

Those who take the recommended dose rarely experience any negative effects. But slight drowsiness or dizziness can occur.

Taking higher doses recreationally it increases perceptual awareness. It also creates a sense of elation.

On the other hand, it can cause disorientation and impaired judgment. It may also lead to distorted perception of time. And it can cause hallucinations.

Diazepam

Diazepam depresses the central nervous system. Doctors widely prescribe it. Recreationally, it increases the effects of alcohol or opioids.

Some cocaine users take it to increase the cocaine level at which seizures occur. Many heroin users take it to increase the effects of heroin. And both cocaine and heroin users often use it to reduce withdrawal symptoms.

A single low dose of diazepam for medical purposes can seriously impair driving skills. Problems can include poor thinking, reduced ability to divide attention, Also poor attention, lower coordination, and reduced reaction time.

Recreational users generally take higher doses. These can cause slowed reflexes, disorientation, tremor, blurred vision, and hallucinations. Some of these impairments can last for days.

Diphenhydramine

Diphenhydramine is also a central nervous system depressant. Doctorss prescribe it to relieve a number of conditions. A single dose for medical purposes can reduce driving ability for four hours. It reduces driving performance more than alcohol at levels over the legal limit.

Diphenhydramine causes drowsiness, impairs concentration, reduces vigilance and slows reaction time. It also reduces divided attention, impairs the estimation of time, and reduces psychomotor ability.

Ecstasy

Ecstasy is a less powerful stimulant than amphetamine. It can reduce vision, cause tremors, reduced attention, and lessened ability to divide attention.

Predicting the effects of ecstasy on driving performance is hard. It can cause greater driving speed and changes in speed. But it doesn’t degrade all driving tasks. It improves some. The effects of drugs on driving is not simple.

Gamma-hydroxybutyrate (GHB), gamma butyrolactone  (GBL) and butanediol (BD)

Gamma hydroxybutyrate is a chemical produced naturally within the body. It’s also made in laboratories.

Because of its dangers, it is illegal for recreational use in the U.S. The generic name is sodium oxybate. It has the trade name Xyrem. It’s used to treat symptoms of narcolepsy. Also to reduce pressure within the skull after head injury.

Illegally, it’s used for weight loss, muscle building, and sexual arousal. It’s commonly used as a “date rape” drug.

GHB, GBL, or BD can cause confusion, impaired memory, visual hallucinations, and aggressive behavior. Combining with alcohol can increase these effects.

Ketamine

This drug is an anesthetic. It’s usually used on animals. For recreation, it can be injected, snorted. Or it can be added to beverages, joints, or cigarettes.

Street names include cat Valium, green, jet, K, Special K, super acid, and super c.

Ketamine can cause amnesia, hallucinations, and numbness. It can cause a detached, dream-like state in which the user finds it difficult to move. Therefore, it can be a “date-rape” drug.

Lysergic acid diethylamide (LSD)

LSD has no known medical value. Users take it for its effects. These may include hallucinations, increased sensations, distorted sense of time, and impulsive behavior. Users may have strange sensations, shifting emotions, a sense of the mind leaving the body, and a blending of senses. For example, hearing colors or seeing sounds.

Clearly, any of these effects could be disasterous in driving.

Methethamphetamine

This drug is sometimes used to treat attention deficit hyperactivity disorder. It’s also used to treat obesity.

Methamphetamine is a nervous system stimulant. Its effects can include greater alertness, and faster reaction time. Also poor coordination, paranoia, poor impulse control, aggression, delusions and hallucinations. These effects may increase or decrease driving ability.

People can take methamphetamine by inhaling, smoking, swallowing, snorting, or injecting it. Common names are meth, speed, crystal, ice, glass, chalk, and Tina.

Opioids (morphine and heroin)

These drugs are narcotics. They block pain. Milder forms of opioids can help reduce coughs. They can ease severe diarrhea. Patients can take opioids by mouth, nasal spray, skin patch, or injection.

The effects of an opioid depends on the dose, the route (mouth, etc.) it’s taken, and tolerance. Both morphine and heroin have similar effects. These include drowsiness, mental confusion, and inability to concentrate. Also distractibility and slower reaction time.

The effects of heroin can last up to five hours. Those of morphine  can be for up to six hours.

Phencyclidine (PCP)

Veterinarians use phencyclidine to anesthetize animals. Use for recreation is for a hallucinogen and psychedelic. Street names include angel dust, hog, lovely, wack, embalming fluid, and rocket fuel.

PCP can greatly impair driving skills. The effects include blurred vision, reduced memory, confused thinking, and disorientation. poor concentration, hallucinations and paranoia.  Also aggressiveness, lower coordination, and distorted perceptions of space.

Users can suffer a reduced reaction time for up to 14 hours.

Toluene

This is a solvent found in paints, glues, and nail polish remover. Printers and tanners also use it in their work. Toluene acts as a nervous system depressant.

The drug causes confusion, drowsiness, reduced alertness, impaired color vision and reduced ability to concentrate. It also causes delusions, distorted perceptions of time and space, memory loss, and slowed reaction time.

Zolpidem (and zaleplon, zopiclone)

These drugs (zolpidem, zaleplon and zopiclone) depress the nervous system. Doctors prescribe them in very low doses on a short-term basis for severe insomnia.

Each of these drugs can cause drowsiness, slow reflexes, problems thinking clearly, double vision and confusion. Also difficulty concentrating, impaired memory, slow reflexes, poor coordination, and hallucinations. Some of these impairments can last up to eight hours.

Higher doses of zaleplon and zopiclone can cause impairment of driving-related skills for up to ten hours.

The drugs caffeine and nicotine are legal and widely-used. They generally improve driving skills. They also tend to counter some of the negative effects of some other drugs.

III. Reduce Your Risk of Arrest

Alcohol

Breath testers are inaccurate. That’s because they don’t really measure BAC. They only estimate it indirectly. And many things can cause problems with these estimators.

Therefore, it’s wise to keep your BAC well below the legal limit. This reduces the risks of arrest as well as accidents.

Here are some hints.

• Remember that the pure alcohol content of standard drinks is equivalent.
• A good rule of thumb for most people is to have no more than one drink per hour.
• Avoid punches and drinks in strangely-shaped containers. (That’s because it’s harder to know how much alcohol you’re getting.)
• Decline offers of drinks that don’t meet your drinking plan.
• Always eat while drinking. This is very important.
• Alternate non-alcoholic drinks between alcoholic ones.
• Never play drinking games or try to keep up with others. (They’ll get the ticket or the hangover. You don’t want either.)

Be Inconspicuous

Be an inconspicuous driver. Here are some tips.

1. Keep your car in excellent mechanical order. For example, make sure brake lights, directional signal lights, and brake lights work.

2. Obey all rules of the road. Don’t go through red lights, stop completely at stop signs, signal for lane changes, etc. Don’t speed, but don’t drive too slowly. Try to drive with the flow of traffic or just a little slower.

3. Consider having a Designated Driver or calling Uber or Lyft. Or be a Designated Driver yourself. These choices really eliminate your risk of arrest.

Never, ever take a field sobriety test for drunk or drugged driving. No state requires it. And about one-third of completely sober people (0.00% BAC) fail them under ideal conditions. Learn more at Never Take a Field Sobriety Test Say DUI Lawyers.

Drugs

Carefully follow the directions and warnings on all over-the-counter and prescription drugs. Avoid illegal drugs.

Here are some hints for avoiding arrest, even if you’re innocent.

First, follow tips #1 through #3 above for avoiding DUI arrest. In addition,

4. Avoid driving in areas where drug dealing is common.

5. Don’t drive between midnight and 4:00 a.m. That is, if you don’t need to.

6. Avoid driving in areas of adult entertainment. Such as strip or “gentlemens’ clubs” and prostitution.

It’s a good idea to prepare now in case you get pulled over for either drunk or drugged driving. To do so, visit the “Prepare Now” section at the bottom of Detecting Drugged Driving.

IV. Resources for Drunk and Drugged Driving

Drunk Driving Resources

• • Drinking and Driving. A Crash Course. eVideo.
  • Goodman, K. and Simon, K. Safe Road Home. Stop Your Teen from Drinking & Driving.
  • Hansen, B. Punishment and Deterrence: Evidence from Drunk Driving. (webpage)
  • Head, W., and Joye, R. 101 Ways to Avoid a Drunk Driving Conviction.
  • Kiesbye, S. Drunk Driving.
  • Mendralla, V. and Grosshandler, J. Drinking and Driving, Now What? (Juv.)
  • Nichols, J. and Ross, H. The effectiveness of legal sanctions in dealing with drinking drivers.
  • Shore, E. & Ferrari, J. Preventing Drunk Driving.
  • Van Tuyl, C. Drunk Driving.

Drugged Driving Resources

• • DuPont, R., et al. The need for drugged driving per se laws. Traff Inj Prev, 13(1), 31-42. (online)
  • FDA Regulation of Drugs of Abuse Tests. (webpage)
  • Drug Impaired Driving. (webpage)
  • What Do We Really Know About Drugged Driving? (webpage)
  • Reducing Drugged Driving and Protecting Public Health and Safety.
  • “Guilty [of Drugged Driving] Until Proven Innocent.” (video)
  •  Stop Drugged Driving.
  • Talpins, K., et al. The Miami-Dade Protocol: Making Drugged Driving Enforcement a Reality.  J. Alco Drug Depend, 3.
  • Teigen, A. Drugged Driving.

Other Resources for Drunk and Drugged Driving

• • Impaired Driving.
  • de la Pena, F. and de la Pena, M. A Layman’s Guide to Criminal Defense.
  • Sagstetter, R. Rights During a Police Stop / DUI.

Note

• • This site gives no advice. Please see a lawyer for drunk and drugged driving matters. And a doctor for medical advice.