State
| Checkpoints Conducted? | Frequency | Legality |
Alabama | Yes | Throughout the year | Upheld under federal Constitution |
Alaska | No | | No state authority |
Arizona | Yes | At least once per month | Upheld under federal Constitution |
Arkansas | Yes | Weekly | Upheld under state and federal Constitution |
California | Yes | 2,500+ annually | Upheld under state and federal Constitution |
Colorado | Yes | Once or twice a month | Upheld under state and federal Constitution |
Connecticut | Yes | | Upheld under state Constitution |
Delaware | Yes | Monthly January to June; weekly July through December | Upheld under state law and federal Constitution |
D.C. | Yes | Once or twice a month | Upheld under federal Constitution |
Florida | Yes | Between 15-20 per month | Upheld under federal Constitution |
Georgia | Yes | Weekly | Upheld under state and federal Constitution |
Hawaii | Yes | Weekly | Authorized by statute |
Idaho | No | | Illiegal under state law |
Illinois | Yes | Several hundred per year | Upheld under federal Constitution |
Indiana | Yes | | Upheld under state Constitution |
Iowa | No | | Not permitted - statute authorizing roadblock controls does not authorize sobriety checkpoints |
Kansas | Yes | Once or twice a month | Upheld under state law and federal Constitution |
Kentucky | Yes | Weekly | Upheld under federal Constitution |
Louisiana | Yes | | Upheld under state Constitution |
Maine | Yes | | Upheld under federal Constitution |
Maryland | Yes | Weekly | Upheld under state and federal Constitution |
Massachusetts | Yes | Year round | Upheld under state and federal Constitution |
Michigan | No | | Illegal under state Constitution |
Minnesota | No | | Illegal under state Constitution |
Mississippi | Yes | Weekly | Upheld under federal Constitution |
Missouri | Yes | Once or twice a month | Upheld under state and federal Constitution |
Montana | No | | Statute permits only safety spotchecks |
Nebraska | Yes | 6 - 10 per month | Upheld under state law |
Nevada | Yes | Once or twice a month | Authorized by statute |
New Hampshire | Yes | Weekly, weather permitting | Authorized by statute (must be judicially approved) |
New Jersey | Yes | Once or twice a month | Upheld under state and federal Constitution |
New Mexico | Yes | | Upheld under state and federal Constitution (law enforcement must follow guidelines) |
New York | Yes | Weekly | Upheld under federal Constitution |
North Carolina | Yes | Weekly | Authorized by statute |
North Dakota | Yes | | Upheld under state and federal Constitution |
Northern Mariana Islands | Yes | Twice a month | |
Ohio | Yes | Year round | Upheld under state and federal Constitution |
Oklahoma | Yes | Once or twice a month | Upheld under state and federal Constitution |
Oregon | No | | Illegal under state Constitution |
Pennsylvania | Yes | Several hundred per year | Upheld under state and federal Constitution |
Rhode Island | No | | Illegal under state Constitution |
South Carolina | Yes | | No state authority |
South Dakota | Yes | Weekly | Upheld under state and federal Constitution |
Tennessee | Yes | Once or twice a month | Upheld under state and federal Constitution |
Texas | No | | Illegal under Texas' interpretation of federal Constitution |
Utah | Yes | About every other month | Authorized by statute |
Vermont | Yes | Weekly | Upheld under state and federal Constitution |
Virgin Islands | Yes | Monthly and during national mobilizations and local festivals and carnivals | |
Virginia | Yes | Weekly | Upheld under state and federal Constitution |
Washington | No | | Illegal under state Constitution |
West Virginia | Yes | Weekly | Upheld under state and federal Constitution |
Wisconsin | No | | Prohibited by statute |
Wyoming | No | | Prohibited by interpretation of roadblock statute |