Ok how about murder? Guy murders someone by hitting them when he is drunk. Rich guy with a good lawyer and connections in the community gets community service, but the poor, black man with a pot possession misdemeanor when he was 15 gets life in prison.
You completely missed my point, let me clarify my example. Two guys got drunk and killed someone while they were driving. One of them was a rich guy with connections, the other was a poor black guy with a criminal record. The rich guy gets a very light sentence and the black guy gets a much more serious charge. In this example the laws were selectively, subjectively, enforced.
This can happen with any law, with every law. I can come up with different examples all day. Every law, and all laws can be selectively enforced.