system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: How is paid suspension even a punishment for police officers?
gpt
Everyone is presumed innocent until proven otherwise.  

Therefore, in the first case, "alleged misconduct" means that the officer could have done something wrong but they are not sure yet. He is innocent for now, until they can prove otherwise.  
It would be unfair to penalize him by cutting his pay (he is innocent for now, remember). But they still don't want him working because they don't want to risk him doing it again, so they send him home.

In the second case, the officer has been declared responsible for his negative actions (guilty) so they penalize him by not paying him for a while.