Anyone who saw the initial arrest and the admission of any field sobriety tests may be present at the hearing. This includes the arresting officer, although they are not required. To ensure their presence, you may request the court issue a subpoena. All evidence from the initial scene should be available (police report, video camera footage, tapes of the 911 call, footage filmed by witnesses, the witness themselves), and a lawyer knows how to request these. The presiding judge will answer your questions during the hearing, but cannot give you legal advice. A lawyer can assist you throughout the hearing so you understand what is happening.