鑑定證據 鑑定調查判斷 證據能力 證據證明力 普遍接受原則 改造槍枝 動能 殺傷力 性能檢驗法 實際試射法 Forensic evidence Investigation and evaluation of evidence Admissibility of evidence Reliability of evidence Rule of general acceptance Converted replica gun Kinetic energy Function tests Test firing