HB 1258 -- Operating a Vessel While Intoxicated Sponsor: Cooper (155) This bill allows any law enforcement officer certified pursuant to Chapter 590, RSMo, to administer a portable chemical test to any person suspected of operating a vessel while intoxicated. The results of the tests will be admissible as evidence of probable cause and as exculpatory evidence, but will not be admissible as evidence of blood alcohol content.Copyright (c) Missouri House of Representatives