The RCMP's National Forensic Laboratory removed an entire lot of test tubes from use after a tube with a hole in it was discovered during the processing of DNA samples in the Ibrahim Ali murder case, a B.C. Supreme Court jury heard this week.
The jury at a Burnaby murder trial has learned that an entire lot of test tubes was removed from use at the RCMP’s National Forensic Laboratory after tubes with pin-sized holes were discovered during the processing of DNA samples related to the case.
Answering questions from Crown prosecutor Colleen Smith, they talked about the process of handling the samples, which they received in test tubes, and about how DNA is extracted. In a batch of samples Ip worked on two days after the girl’s body was found in July 2017, one negative control, which should not have turned up any DNA, did, after being contaminated by a sample from another unrelated case.
She said part of a sample of skin cell DNA leaked out, but the sample had already been analyzed and had been put into a new tube so it could be returned to police when that new tube was found to be defective.Another sample of sperm cell DNA was not affected, according to Li. Besides honing in on event reports, McCullough questioned each witness about their independent recollection of events, highlighting their dependence on notes and reports produced at the time to recall specific information, including whether or not checks and controls had actually been completed or whether boxes on the forms had simply been checked off.
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