I find the drug charges section especially damning, I'd like to hear more analysis of that particular part.
For the lazy, the footnote basically says that the discontinuity at 280g is not caused by an increase in seizures at this amount (which would indicate police fraud), but by prosecutors choosing to charge defendants at slightly above the 280g threshold when the amount seized was actually significantly larger than the threshold.
The change the law increased the amount the police had to plant on someone to lock them away in a federal penitentiary, and they had not expected it to show up so strongly in the data. Back when the minimum was 50g they could hide in the noise but at 280g it stands out.
In a well functioning society this would trigger investigations of all of the cases where the suspect was charged with carrying just over the limit on suspicious of police misconduct, but the police don't want that so it's not going to happen.