Fruit of the poison tree
Chalk one up against hippie profiling. These two kids got off on a 3lb marijuana bust because the cops lied about the pretext for the stop. They claimed the kid was on his cell phone and that's why they pulled him over. However technology works both ways and the cell phone records showed no calls on their phones during the time frame in question.
Suppression hearings are why you should never consent to a search. Know your rights in a stop. Check out the indispensable video Busted.
[hat tip to JackL]