Suggest two methods to determine which knife the metal fragment came from ? The

Question

Suggest two methods to determine which knife the metal fragment came from ? The methods should be based on entirely different concepts.
o Singtel 4G 6:05 PM 100% 1 of 3 The Roti Prata Murder Early one morning, police are called to the Jalan Locard Eating House following a call from Mrs Wong, owner of the drinks and beverages stall. They find the body of Mahbub Ali, owner of the "Prata and Briyani Delights" stall, lying face up on the floor in a pool of blood. The body is cold. Part of the floor is covered in a substance that is thick, sticky and brown, yet pleasantly smelling. The stall is in disarray and a large cooking pan is on the floor. Blood spatter is observed on the wall, about 1.5 m above floor level at the point marked BS1 (see diagram on page 3). Complicated blood spatter is also observed on the work bench, in the position marked BS2, and on the pancl above the serving area above the position marked BS3. Two sets of sticky brown shoeprints are observed, leading away from the stall. Sketches of a partial shoeprint from each set are shown below Subsequent examination of the body reveals a deep stab wound to the neck, near to the throat, but no other injuries except for some partially healed cuts on his hands. The wound to the neck is considered to be the cause of death by the pathologist as an artery was severed. The pathologist offers the opinion that death was very rapid. During the autopsy, a small metal fragment is recovered from the body. It appears to be a fragment of a knife blade, broken off by impact with bone Enquiries amongst the stall owners and regular customers reveal that the deceased Mahbub Ali, was the most successful stall holder at the Eating House, due to the quality of his prata and briyani. This had caused serious losses for Mr Tan, owner of the "Tan's Yummy Vegetarian Food stall and Mr Yeow, owner of "Edwin's Gourmet Noodles" Several customers mentioned that Mahbub Ali had been very proud of his cuisine, and this had caused many arguments w ith Mr Tan and Mr Yeow During a search of the Eating House and the immediate area, a large knife (knife 1) is found in a drain. It is observed that the blade is won and damaged, but sharp. However, a similarly old knife (knife 2) is found in Mr Tan's food stall. A blue fibre is found caught on a protruding screw on the side of the working bench in Mahbub Ali's stall, at the position marked X.

Explanation / Answer

Probably the second knife had been used for killing. As if it a planned murder then the murderer might have come with the knife. Moreover the post marturm report itself say that it was very quick act so chances are that knife number 2 has been used for killing. As if murderer have come barehand and then snatched knife from mahbub ali then the scene could have been different.

Hope it hepls you!

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