Are you OK to drive, or should you call a cab?
If you make the wrong decision, you may end up in jail or worse.
You will meet lawyers. You will wear out your checkbook. And you
will flinch when the car insurance bill comes.
Or you could buy your own personal breathalyzer and blow.
Devices cost $3 to $300, and their accuracy varies almost as
much. The wrong device is worse than useless if it puts a drunk
behind the wheel.
Yet more and more people are slipping one into their glove
compartments. According to Wintergreen Research, sales of
breathalyzers hit $284.6 million in 2011, and they forecast that
number will climb to $3.2 billion by 2018 as prices fall and
accuracy improves. In fact,
already requires that all drivers carry one.
A guide, not a guarantee
In the end, the only number that counts is the one on the police
A first-time DUI can cost thousands in court fees and will
easily double your rates, says Penny Gusner, consumer analyst with
CarInsurance.com. A second DUI may send your rates up 300 percent
-- when you get your license back. (See "
Calculate your limit: Avoid a DUI disaster
A final caveat: Blowing a number under the legal limit is not a
free pass to drive. Impairment is more than just a breathalyzer
number, and it is possible to be under the legal limit and still be
According to Gusner, the insurance premium jump for impaired
driving is going to be very similar to a DUI conviction.
"I would give myself a wide, wide margin of error," Gusner
A long way from the Drunkometer
While alcohol intoxication is defined as a blood alcohol
concentration (BAC), testing blood is just not feasible when you
are out on the town.
The modern, portable method of measuring breath alcohol
concentration emerged in 1954, when Robert F. Borkenstein, a
forensic scientist with the Indiana State Police, perfected the
Breathalyzers work because alcohol shows up in the breath. It is
not digested, or even chemically changed in the bloodstream. While
the police use desktop spectrophotometer units at the station to
collect a reading that can be introduced in court, they use
personal breathalyzers out on the road.
If you're shopping for personal use, four types are
Allen D. Porter, president of DrinkingAndDriving.Org, says fuel
cell breathalyzers closely mirror what law enforcement officers in
the field. The fuel cell produces an electrical charge when it
interacts with alcohol that can be precisely measured and
translated into a BAC reading.
Prices start around $100, and high-end models run over $300.
Breathalyzers that use a semiconductor as a sensor range from
strictly novelty items to models that rival fuel cells in accuracy.
The type of semiconductor material is what separates the toys from
the real thing, Porter says.
Silicon oxide-based models are more expensive, ranging from
about $85 to $250, but are considered more accurate.
These are single-use disposable units. You simply squeeze the unit
to activate it and then blow into it. The crystals will change
color if you are blowing over a set BAC level. According to Porter,
they are popular with the military and fairly accurate.
These disposable units are priced around $3 but can be cheaper
Keychains and phone apps:
Breathalyzers that cost less than $50, come on a keychain or
connect to your iPhone are best considered novelties for
entertainment purposes. (Some apps, for example, track your eye
Personal breathalyzers are available at a variety of stores.
Amazon carries a wide selection, as do Best Buy, Target and even
Wal-Mart. Specialty websites such as
offer every brand under the sun.
Finding the right breathalyzer
Regardless of the type you choose there are a few things you
should look for in a personal breathalyzer.
The Food and Drug Administration considers breathalyzers to be
medical devices and certifies them as safe after testing. Any
breathalyzer that lacks FDA certification is sure to be
Accurate breathalyzers have a mouthpiece that is directly
attached to the breathalyzer. This ensures that the sample is not
contaminated by smoke or other pollutants in the air. The
mouthpiece should be removable and washable. Most models come
with extra mouthpieces.
A breathalyzer is only useful if it is accurate. The highest
accuracy ratings run around +-0.005. Most experts recommend a
breathalyzer with an accuracy rating of at least +-.01.
An accurate breathalyzer will require calibration at some point
in its lifetime, with the exception of disposable units. If it
doesn't require recalibration by its manufacturer, it may not be
accurate enough to rely on. Fees range from $20 to $50. Currently
there are models on the market that use a replaceable sensor
module, eliminating the need for factory calibration.
Experts say you should wait at least 20 minutes from your last
drink or cigarette to check your BAC. This will give the most
They also advise some practice in the security of your own home
to make sure you know how to use the device before trusting it
The consequence for poor accuracy? A highly accurate,
state-sponsored model you'll have to use every time you turn the
New DUI strategy: Your car won't start