[1] On October 16, 2007, at about 1:15 a.m., Karamatsu lost control of his vehicle and struck a concrete pillar while travelling west-bound on the Moanalua Freeway.
Karamatsu failed a police sobriety test and was found to have a blood alcohol content of .171 - more than twice the legal limit of .08.
Karamatsu had previously been cited by law enforcement for speeding violations.
[2] As a result of the October 2007 incident, Karamatsu stepped down from his position as Vice Speaker of the Hawaii House of Representatives.
In November 2008, it was announced that Karamatsu would serve as Chair of the House Judiciary Committee.