(Sec. 2) Amends the Immigration and Nationality Act to authorize an INS officer who: (1) has reasonable grounds to believe that a driver at a land border port of entry may be operating a motor vehicle under the influence of alcohol to require the driver to submit to a breath test; and (2) arrests a driver for operation of a motor vehicle under the influence of drugs or alcohol to require the driver to submit to a blood, breath, or urine test.
(Sec. 3) Requires the Attorney General to post notice at each land border port of entry that operation of a motor vehicle with a drug or alcohol in the driver's body at such port of entry is a Federal offense.
(Sec. 4) Requires the Attorney General to issue regulations authorizing an INS officer to impound a vehicle operated at a land border port of entry if: (1) the driver refuses to submit to a chemical or other test; and (2) the impoundment is not inconsistent with the laws of the State in which the port of entry is located.