The article doesn't account for a number of possible mitigating factors.
Like, does the suspect have priors, the suspects general attitude, is the suspect cooperative, etc.
Just going by what my eyes and ears have shown me, blacks tend to be more combative when dealing with the police.
Also, location seems to be a factor. In high crime areas with a lot of drugs, there is going to be more heat, hence, more arrests.
I'm willing to bet that the police get to know their beat over time and after seeing the same people sent back to the street over and over again to continue breaking the law, they tend to crack down more.
At any rate, if the police are trying to make the streets your children play on safer, people should be commending them rather than the usual bitching and moaning.