Dismissed= the court or prosecutor has decided the charge against you should not go forward, terminating the case. No charges filed/Charges dropped: means the prosecutor has declined to pursue the case.
There are some secrets things in your life that people know about you! If, they ever shared it, it would possibly ruin your life! You have not adventured out to chase a dream you have, get into a new relationship, start a new business or write a book because you are afraid that your pass will come back and hurt you! You need to dismiss the pass! Even if your pass came up again, use it as a stepping stone or as a tool to help someone else not make the same mistakes as you have.