Dunno if the USC story is true but it wouldn't be the first time and it surely won't be the last time this happens.
Every time I hear such a story, not only here but everywhere, it turns my stomach and makes me feel sick to the heart. It's so sad ;( !
Too few honest people on this planet and those who are throw the towel because of some greedy selfish f***.
A proverb I like very much goes as follows:
Taking fills your hands
Giving fills your heart
Back to topic
@Coldcanna: You are correct. These constituents are rare in many plants and often located to specific plant organs, most often flower petals. For example the reds and purples in beetroot, amaranth, or opuntia cactus are yet another kind of compounds (betanins, replace flavonoids in these species) whereas that in onion bulbs are atypical flavonoid derivatives, both of those are not present in cannabis.