Request a Criminal Certificate of Disposition from the court. Complete a separate request for each case you will be asking the court to seal.The letter should be polite, concise, and professional, emphasizing personal growth and the benefits of expungement. When you fill out and file a petition for expungement, make sure you know your criminal record. If a record that is supposed to be sealed comes up on your Criminal Records search, you can ask to seal that record. I am writing to request that I be allowed to file a petition for expungement of my criminal record before the required waiting period. You may ask the court to expunge a criminal record. Expungement removes information about a case from court and law enforcement records. You may ask the court to expunge a criminal record. Expungement removes information about a case from court and law enforcement records.