However I know of a case where a guy was going home (G'ma's) around midnight. On a dark road, just down from his G'ma's, there was a drunk guy who walked out in front of him, and was hit by the kid. The kid had no clue what to do so he called his Grandma for help. The G'ma said that she'd call 911 and for him to drive down to get her so that she could help him. He did, and they returned immediately. When they returned, the G'ma believed the guy was dead (she was right). LE asked at the scene if he had been drinking or taken any drugs. He honestly told them that he had smoked a little pot very early that afternoon. Now, anyone who's smoked pot would say that 8-10 hours later, he would have felt no effect, but it would of course still be in his blood system. The kid was helpful and truthful, and this was a sad sad accident. The dead guy had a very high BAC if I recall.
There was talk that this kid was going to be criminally charged with involuntary manslaughter b/c of operating a vehicle with drugs in his system. Additionally, I understand that the drunk guy's family was going to sue him in civil court.
This is a great example of what could happen to these kids if they talk about any drug related activity the night of Lauren's presumed death. The truth is, when faced with something like this, I hope that I'd do the right thing. But sometimes the "right" thing can pose very "wrong" consequences. Not for a minute do I believe the kid I described was guilty of the other guy's death. It was a case of him being in the wrong place at the wrong time.
Maybe it's Puritanical. They believe that the pot smoking is immoral, so if this young man goes to prison, they think it's justice.