There's no question that we've seen some outrageous examples of prosecurtorial overreach in different jurisdictions -- the Zimmerman case and the Duke Lacrosse cases leap immediately to mind. Not sure if that's the case here or not.
As to the initial traffic stop, it's almost a given that it was a "pretext stop" resulting from some sort of narco investigation/enforcment action. The thing is, SCOTUS looked at that very issue in 1996, and ruled (unanimously -- how often does that happen?) in Whren v. US that using a traffic violation as a pretext does not violate the 4th amendment.
I wonder how long before that is reversed?
It only took a decade and a civil war to reverse Dred Scott v. Sanford.