The NCAA has rules against drugs that would apply here, regardless of living in Colorado or Nebraska.
http://www.ncaa.org/...sting+threshold
Those would be pretty toothless rules in the absence of any official criminal charges. However, your link was to an article on permissible threshold amounts of marijuana in NCAA blood tests. Hardly an "any and your done" type of rule. Heck 5 nanograms is a higher limit I believe than what Colorado instituted for driving under the influence.
I don't mean to condone the behavior or to beat this to death before the facts are out but I sense that these "rumor leakers" may be desperate for tasty tidbits and may be anticipating harsher consequences than might be deserved. Or, maybe I'm just being hopeful that is the case.