Apppendix
STATE MLDA AND ZERO TOLERANCE LAW HISTORY

State MLDA21 Law Effective Data Zero Tolerance Law 
(<0.02 BAC, Age Under 21)
Alabama 10/1/85 5/28/96
Alaska 11/1/84 8/10/96
Arizona 1/1/85 6/28/90
Arkansas 1935 8/12/93
California 1933 1/1/94
(Previously 0.05 Age < 18)
Colorado 7/1/87 7/1/97
Connecticut Age 21 9/1/85
Age 19 to 20 10/1/83
Age 18 to 19 7/1/82
10/1/95
Delaware 1/1/84 7/1/95
Florida Age 21 7/1/85
Age 18 to 19 10/1/80
1/1/97
Georgia Age 21 9/30/86
Age 19 to 20 9/30/85
Age 18 to 19 9/1/80
7/21/97
(Previously 0.06 Age < 18)
Hawaii 10/1/86 12/1/97
Idaho 4/10/87 7/1/94
Illinois 1/1/80 1/1/95
Indiana 1934 1/1/97
Iowa Age 21 9/1/86
Age 18 to 19 7/1/78
7/1/95
Kansas 7/1/85 1/1/97
Kentucky 1938 10/1/96
Louisiana 3/15/87 7/15/97
Maine Age 21 7/1/85 Age 18 to 20 10/24/77 9/29/95
Maryland 7/1/82 5/29/90
Massachusetts 6/1/85 6/27/94
Michigan 12/21/78 11/1/94
Minnesota Age 21 9/1/86
Age 18 to 19 9/1/76
6/1/93
Mississippi 10/1/86 1998
Missouri 1945 8/28/96
Montana Age 21 4/1/87
Age 18 to 19 1/1/79
10/1/95
Nebraska Age 21 1/1/85
Age 19 to 20 7/19/80
1/1/94
Nevada 1935 7/16/97
New Hampshire Age 21 6/1/85
Age 18 to 20 5/24/79
1/1/93
New Jersey Age 21 1/1/83
Age 18 to 19 /80
12/17/92
(Previously 0.04 Age < 21)
New Mexico 1934 1/1/94
(Previously 0.05 Age < 18)
New York Age 21 12/1/85
Age 18 to 19 12/4/82
11/1/96
North Carolina Age 21 9/1/86
Age 18 to 19 10/1/83
9/15/95
(Previously 0.00 Age < 18)
North Dakota 1936 7/1/97
Ohio Age 21 7/31/87
Age 18 to 19 8/19/82
5/4/94
(Previously 0.02 Age < 18)
Oklahoma 11/1/85 11/1/96
Oregon 1933 7/1/91
Pennsylvania 1935 8/2/96
Rhode Island Age 21 7/1/84
Age 19 to 20 7/1/81
Age 18 to 19 7/1/80
6/30/95
(Previously 0.04 Age < 18)
South Carolina Age 21 9/14/86
Age 19 to 20 1/1/85
Age 18 to 19 1/1/84
7/1/93
South Dakota Age 21 4/1/88
Age 18 to 19 7/1/84
1998
Tennessee Age 21 8/1/84
Age 18 to 19 6/1/79
7/1/93
Texas Age 21 9/1/86 Age 18 to 19 9/1/81 9/1/97
Utah 1935 7/1/92
Vermont 7/1/86 9/1/97
(Previously 0.02 Age < 18)
Virginia Age 21 7/1/85
Age 18 to 19 7/1/81
7/1/94
Washington 1934 7/1/94
West Virginia Age 21 7/1/86
Age 18 to 19 7/1/83
6/12/94
Wisconsin Age 21 9/1/86
Age 18 to 19 7/1/84
10/14/97
(Previously 0.00 Age < 19)
Wyoming 7/1/88 1998

Sources: NHTSA; Insurance Institute for Highway Safety; O'Malley and Wagenaar (1991).

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