Status of Ignition Interlock Laws States that require ignition interlocks for all offenders have experienced significant reductions in drunk driving fatalities. For example, drunk driving fatalities have decreased by 52 percent in West Virginia since its law was enacted in 2008. Drunk driving fatalities in Arizona have dropped 41 percent since 2007, and other states, such as Mississippi, Louisiana, Kansas and Delaware, have experienced reductions of 28 to 39 percent. IGNITION INTERLOCKS Combined with enforcement efforts, ignition interlocks are the best-proven countermeasure available to stop drunk driving. Today, 30 states and Washington, D.C. require ignition interlocks for all offenders, and every state in the nation has an ignition interlock law in the books. In addition to the 30 states with all-offender interlock laws, nine other states require ignition interlocks for first-time offenders with a BAC of .15 or greater, and two — Pennsylvania and Iowa for .10 and higher. Only two states reserve interlocks only for repeat offenders: Massachusetts and Idaho. Other states require interlocks for repeat offenders but allow judges the option to order the devices for first-time offenders too: Montana, Indiana and Michigan. However, interlocks are rarely, if ever, used for first-time offenders in these states.
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WA
ME
MT
ND
MN
VT
OR
.16 BAC
NH
WI
ID
NY
MA CT
SD
MI
WY
RI
.17 BAC
IA
PA
NJ
NE
.10 BAC
.10 BAC
NV
OH
IN
DE
IL
DC
UT
MD
CA
CO
VA WV
KS
MO
KY
NC
MAP LEGEND
TN
OK
AZ
AR
SC
NM
All-Offender
MS AL GA
Mandatory for all first offenders with a BAC of .15 or greater (unless if BAC is noted differently)
LA
TX
FL
Mandatory for all repeat offenders
AK
Discretionary or optional law
HI
A California pilot program requires interlocks for all convicted DUI offenders in four counties
Revised July, 2017
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