Quote Originally Posted by Zedleppelin
A blood test can determine if a person is under the influence, or high, unlike urine tests.
I think you are incorrect. Can you cite a source?
cologrower420 Reviewed by cologrower420 on . semi driver in fatal, 'on' marijuana so does this mean his piss test was positive, or that he was ripped at the time of the accident? 'had been smoking marijuana' - when? while he was driving? a half hour ago? yesterday? 2 weeks ago?? -- Semi driver smoking pot during Commerce City double fatal - The Denver Post A semi-tractor trailer driver had been smoking marijuana when he crossed into oncoming lanes and caused a fiery crash with a dump truck that killed himself and the other driver earlier this year. Daniel Rating: 5