Incredibly localized and subject to personal biases/ambitions for the prosecution. So sometimes you will see a huge majority of cases under certain categories d

Incredibly localized and subject to personal biases/ambitions for the prosecution. So sometimes you will see a huge majority of cases under certain categories dropped to boost their numbers (or because it makes sense, like the generally unlawful arrests during the George Floyd protests) and sometimes you will see an insane stacking of cases that will never win in order to boost other numbers and project a 'tough on crime' persona. See: Horrible Dickhead-Sheriff Joe Arpaio (sheriffs in many places have large overlap with prosecutors' duties)