Why did the chemist focus only on blood DNA tests?

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The Chemist Prioritised Blood DNA Due to its Greater Strength

The chemist, Nor Aidora Saedon, specifically focused on blood DNA tests when examining samples from the Papar school dormitory because blood DNA is considered a more robust indicator. This approach was taken to definitively identify the owner of the blood found on various items, rather than to ascertain who might have handled them. The aim was to establish the presence of the student's blood, which was deemed the most direct and reliable method for forensic identification in this context.
Blood Traces Identified as Belonging to the Deceased Student

Nor Aidora Saedon confirmed that blood traces discovered on several pieces of paper and other items from the school dormitory were indeed those of the 13-year-old student, Zara Qairina Mahathir. The DNA profiles obtained from these blood samples were a direct match to the schoolgirl's genetic material. These findings are crucial components of the forensic evidence being presented to reconstruct the events leading up to Zara Qairina's fatal fall.
Focus on Blood DNA for Definitive Identification

The chemist explained her methodology, stating that she only collected blood swabs from the pages in question, which are believed to be part of the student's journals. She explicitly mentioned, "Blood DNA is much stronger so I focused on that." This deliberate choice underscored the priority of confirming the source of the blood rather than pursuing the more complex and potentially less conclusive analysis of other cellular DNA, such as touch DNA.
Establishing Presence, Not Contact

The primary objective of Nor Aidora Saedon's analysis was to ascertain the identity of the individual whose blood was present on the examined materials. The statement, "The aim was to find out whose blood was on the page, so we did not look for who touched the page," clearly delineates the scope of her investigation. This focus on blood DNA was intended to provide clear, irrefutable evidence of the student's biological material at the scene.

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Why did the chemist focus only on blood DNA tests?

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