The ERDI Testifying in Court manual is an invaluable asset that should be read before you embark on any PSD(Public Safety Diver) or SAR(Search and Rescue) dive. As every PSD or SAR diver knows, any dive can turn into a legal case that then must be tried in a court of law. It is critically important to be prepared and understand what your role is when you get called to the witness stand. Know the facts and make sure you have done the preliminary work required.