The NTSB recommended last December that states require ignition interlocks for all DUI offenders and said states should improve interlock compliance.

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Similar interlocks were found at all the other companies with such contracts.

FORBES: Why Should We Care About Corporate Interlocks?

The board also recommended that all suspected drunken drivers whose licenses are confiscated by police be required to install interlocks as a condition of getting their licenses reinstated even though they haven't yet been convicted of a crime.

WSJ: U.S. Board Urges 0.05 Drunk-Driving Threshold