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 Ignition interlocks use a built-in breath analyzer. If the driver’s
blood alcohol limit is above the programmed limit - usually 0.02
grams per deciliter - the car does not start.
“We were able to see a real improvement in states that require them
for all drunk driving convictions,” said lead author Elinore J.
Kaufman, a student with the Health Policy Program at the University
of Pennsylvania in Philadelphia.
A 15 percent decrease in deaths represents “a big change,” Kaufman
told Reuters Health by phone.
While every state in the U.S. has some ignition interlock
legislation, not all require them. Between 2004 and 2013, 18 states
made ignition interlocks mandatory for all drunk driving
convictions. (Today the number of states with those laws has grown
to 23, according to the National Conference of State Legislatures.)
The researchers used data from the National Highway Traffic Safety
Administration for 1999 to 2013, including alcohol involved crash
deaths in those 18 states and in the 32 states without interlock
requirements.
In the country as a whole, alcohol-related crash death rates rose
from 6.1 to 6.4 per 100,000 people per year between 1999 and 2001,
then fell to 4.3 deaths by 2013.
There were very small decreases in alcohol-related crash deaths in
states with universal interlock laws in the two years after
implementation, which dipped considerably in year three compared to
states without the laws.
Accounting for year, vehicle miles traveled per state and other
factors, states with universal interlock laws had 4.7 alcohol
related crash deaths per 100,000 people per year, a 15 percent
reduction from the 5.5 deaths in states without the laws, as
reported in the American Journal of Public Health.
Crash-related deaths that did not involve alcohol were not different
between interlock and non-interlock states.
“Between 2004 and 2013 more than 900 lives were saved, and if every
state had this law it would be 2,600 lives,” Kaufman said.
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“Taking the decision out of the hands of people when they’re already
drunk and making it easier on police can really make a big
difference,” she said.
The interlock devices cost around $150 to buy and install, and the
individual required to have it is responsible for the expense,
Kaufman said.
“It appears that a large number of deaths can be prevented with this
intervention,” said Dr. Timothy Naimi of the Boston University
School of Medicine Clinical Addiction Research and Education Unit,
who was not part of the new study.
But “it’s very important to understand for the public that it
probably takes a minimum of 100 episodes of impaired driving before
one is caught, and oftentimes they are not convicted,” Naimi told
Reuters Health by phone. “Interlocks are an important piece of the
puzzle, but not a cure-all.”
“Although it’s still possible for drivers under interlock orders to
drink and drive (by using a different car), interlocks have been
shown to reduce the likelihood of a drink-driving re-arrest by more
than half,” said Charles M. Farmer, vice president of Research and
Statistical Services for the Insurance Institute for Highway Safety
in Ruckersville, Virginia. “This is an important step in stopping
drivers who habitually drink and drive, but these drivers are only
part of the problem.”
“Most alcohol-impaired drivers do not have any DUI convictions on
their record, so they will not have been assigned an interlock,”
Farmer told Reuters Health by email.
SOURCE: http://bit.ly/1RrkuZQ American Journal of Public Health,
online March 17, 2016.
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