I mentioned profiling earlier, which can be either racial or demographic.
In my opinion, giving police officers an ultimate discretionary power to stop anyone at any time can lead to completely abusive situations. For example, when a bar closes, there could be 20 or 30 people leaving the premises at the same time. Who will the police officer choose to stop? They may decide to stop someone because they are dressed a certain way, because their skin is a certain colour, or because they talk a certain way. In my opinion, that can lead to excesses.