It's supposed to be impossible since you wouldn't take in enough THC from second hand smoke to fail a test. I see it as possible, but very very very unlikely. You'd have to be hot boxing all the time...alll the time to get that much THC in you.
When I was in outpatient rehab I know people used that excuse all the time. But I don't think its possible... when someone smokes weed, they absorb some of the thc. Also, they don't inhale pure smoke, they'll inhale some air. So the smoke they exhale is particularly diluted. Also once they exhale the smoke spreads, which dilutes it even more. So say you where standing a couple feet away from someone as they exhaled smoke, and you inhaled an entire lung full, that would probably be like something like 10-20 less potent as a normal hit. On this topic, has anyone seen news stories of some white trash mom blowing pot smoke in their kids face? It happens allot, and I think its bullshit, but only because smoke of any kind can irritate someones eyes if its blown into their face. But the news stories always try to make it seem like the kid got high, which I think is bs.
Dude I heard all about that! I don't think it would be possible for the kid to get high. The first time I smoked was around 13 and I didn't get high. I smoked two more times and still didn't get high. It was only on my third try that I got high. It was almost like the THC stored up in my body until it was just released by smoking that third time.