蔡天鳳碎屍案搵到新證物 法醫披露點樣檢驗出證物上嘅DNA、全程需時幾耐?

文: U Magazine
2023.05.16

全港矚目嘅蔡天鳳碎屍案開始進行提訊,庭上披露咗更多案中細節,令案情更加曲折離奇。警方喺死者嘅村屋,搵到前家姑DNA嘅外套,仲搵到涉案工具如鋸及電鋸等,兇器多達三十多件,控方表示需要時間去檢驗所有兇器上嘅DNA,以獲得取得更多罪證,其實要檢驗出物件上嘅DNA需時幾耐?對偵破案件有幾大幫助呢?

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根據齒科法醫梁家駒表示,證物送到化驗所後,會有人用浴液將物件表面嘅DNA溶出嚟,再放落一個儀器入面放大、分析,先可以搵出DNA嘅序列,然後再將證物同已知嘅樣本比對,先可以證明DNA屬於邊個,呢個程序係需要至少幾小時,由於係一個法證調查,做完分析之後需要做報告,而而家香港嘅化驗所有大量個案要做,以外國嘅例子,可能要至少一個月或以上先可以完成報告。

法醫梁家駒表示用浴液將物件表面嘅DNA溶出嚟,再放落儀器分析,搵出DNA嘅序列。

再將證物同已知嘅樣本比對,就可以證明DNA屬於邊個,單呢個程序只需要幾小時。

但由於有大量證物化驗要做,再作分析,可能要至少一個月或以上先可以完成報告。

再舉個例子,例如我接觸過你嘅衣服,以前喺搜證方法係搵吓被捕人嘅手或手指甲內,有無有關嘅衣物纖維,大家最記得嘅例子,應該係當年跑馬地紙盒藏屍案,喺死者身上搵到疑凶一件衣物嘅纖維,但現今科技進步咗,就會直接喺衣物上搜尋DNA,再對比返其實有乜嘢人接觸過件衫,其實結果係會更加準確。

昔日跑馬地紙盒藏屍案嘅搜證方法,係喺死者身上搵到疑凶嘅衣物纖維,但現今科技進步咗,就會直接喺衣物上搜尋DNA,再對比返有乜嘢人接觸過件衫,結果會更加準確。

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