"The police can narrow down the scope of their investigation by determining how the bullet was manufactured, because it may have been made with special tools," Lee told reporters, after completing his comprehensive report on the assassination attempt.
Lee presented the report to Andrew Hsia, representative of the Taipei Economic and Cultural Office in New York. The report will be handed over to State Public Prosecutor General Lu Ren-fa.
Lee led ballistic experts to Taiwan in April to visit the crime scene and collaborate with officials.
Lee has confirmed that Chen had suffered a bullet wound across his abdomen.