If you dream that you have been arrested, or that you arrest someone, you may desire more freedom in your waking life.
A dream of being arrested can mean that you need to stop doing something in your waking life, literally arresting your behavior.
The same can be true if your are a police officer arresting someone else in your dream, ie. it could be that you wishto stop them interfering with your life.
If the person being arrested in your dream is someone you don’t know, it could be that they represent a part of you that you would like to be rid of. Try and think what kind of person was being arrested in your dream. Were they greedy, week, sneaky? Whatever the answer is, it could be this aspect of yourself that needs arresting, stopping?