[TheRealVille]

The swab is less accurate than a blood test and is given in the field because the results are known within 10 minutes. If this guy had smoked a single joint, then it would not have been detectable 10 days later. If he was a regular user and smoked his last joint a week earlier, then the blood test would probably detect THC. The oral swab is less sensitive than a blood or urine test, so you are right that the operator might not have tested positively if he had not smoked a joint for a couple of days.

If the operator is shown to have had a significant amount of either THC or pain killer (especially if he has no prescription for it) in his blood at the time of the accident, then he should never enjoy another day of freedom.

All correct, and I agree. Years ago, I passed a pee test 9 days after smoking a joint. More recently(although not very), I passed a pee test 5 days after smoking a joint, but I went on a low fat(what THC clings to) diet, and ran four miles a day, and passed a pee test. If there is one subject I know, and really don't need to look up, it's pot. It's a miracle drug. If it was legal, there would be a lot less problems in the world today.