Forensic scientist Christopher Mckenzie said a 17cm-long (6.5in) hunting knife found at the scene had DNA on it from the three children.
Apart from a small knife found in a sealed Tupperware box in the Zafira, along with fruit peelings, there was no blade.
Police scientists argued that a knife found at Sollecito's home had traces of Kercher's DNA on the blade and Knox's DNA on the handle.
Sharon and Joel Edelson handed in a small mother-of -pearl knife, found among her late father-in-laws belongings.
It was revealed that the knife was found in Simpson's master bedroom but is not the murder weapon.
The knife was found by Mr Suddards's left elbow and two pairs of g-string underwear by his left hip.
Shortly after Nielsen's death, a knife was found by a homeless man not far from the scene of the crime.
According to the official, a handgun was left on a nightstand in the bedroom and a knife was found on the bed.
The bottle, one knife and an empty knife case were found in a bag close to the crime scene at La Defense.
While under the knife, doctors found an even more serious issue.
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"On average that takes two to three minutes for the pocket knife to be identified, for that bag to be pulled, for that bag to be opened, for the knife to be found, " he added.
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"We still haven't found the knife which was used to kill Una, " Mr Grierson added.
Audetat also found a foldable knife with a 4-inch blade in Loughner's front pocket.
Part of the original prosecution case was based on DNA evidence found on a knife and on a bra clasp belonging to Kercher.
The survey also found that a quarter of men had thought about going under the knife.
Mr Bradshaw and Mr Liverpool, both of St Stephens Close, Manchester, were arrested in Cullompton, and weapons were found in their car, including a samurai sword, a lock knife and a hammer, Exeter Crown Court heard.
Kieren and Khalid, both 12, said they found it really interesting and learnt that if you are caught carrying a knife you can spend up to 25 years in prison.
It is alleged they found Mr Millar in Manton Street and he was attacked with a large hunting knife at about 01:30 BST.
Officers said they now know the knife, which was hidden by snow, had been left there shortly before the member of the public found it.
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