Ignition Locks Prevent Repeat DW...(-- also cited possible economic benefits...),Health

One device cost the offender $2.25 per day, leading the authors to estimate that for every dollar spent on interlocks for first offenders, the public saves $3 in damage and destruction caused by DWI crashes.

"Interlocks present an opportunity to help change behavior rather than simply punishing or incarcerating the offender," Marques said. "It's not enough to revoke a license -- 75 percent of all people with revoked licenses drive anyway -- but you don't want to sentence an entire family to poverty if they're dependent on that driver getting to and from his or her job. By installing an interlock, the risk that the DWI offender poses is controlled, and interlocks become a public benefit."

Only about 10 percent of arrested DWIs nationally are ordered a period of interlock-controlled driving, Marques said. Four states mandate interlocks for first DWI offenses: New Mexico, Louisiana, Arizona and Illinois (effective in 2009).

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The National Institute on Alcohol Abuse and Alcoholism offers has more about preventing alcohol abuse.

-- Kevin McKeever

SOURCE: Substance Abuse Policy Research Program, news release, Feb. 11, 2008