Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Breath tests (n = 3,673) conducted between 5:00am on Thursday December 21, 2017 and 4:59am on Friday December 22, 2017. Checkpoints (n = 5) identified among breath tests based on complete linkage hierarchical cluster analysis with cut points at 100 meters.
