Since traces of marijuana can be detected in urine, blood, and tissue long after the drug’s effects wear off, it is not even clear that Eugene was under the influence of pot at the time of the assault. So where does that leave everyone who recklessly speculated that a demon drug was responsible for Eugene’s ghoulish violence? Contrition may be too much to expect, but embarrassment could serve as a deterrent. Before we move on to the next media-driven panic about a scary drug (or some other bogeyman), let’s pause to focus some well-earned scorn on the most egregious offenders in this sorry episode of rumor repetition and herd reporting…