The police were able to track down Kuo's personal notebook computer, but Kuo, being a computer expert, had taken precautions, adding password protection to his files when he saved the list of student names and bribes taken. Temporarily stymied, the Taoyuan prosecutors sought the assistance of the CIB to crack the code.
後來警方循線找到郭振源個人使用的筆記型電腦，才讓案情急轉直下。不過熟悉電腦技術的郭振源早有防範，他在儲存學生名單和收受的賄款檔案資料時，都刻意設下關卡、密碼，以防止他人隨意開啟，桃園地檢署於是請求刑事局協助破解密碼。