While Pathwest had identified 28 quality issues relating to the 17,000-odd Macro Taskforce exhibits - Mr Yovich is now going through other examples of errors made in the lab not featured on the list.
These include a DNA testing review sent to WA Police in 2003 by Mr Bagdonavicius which had several errors within it.
Another was when Jane's watch, recovered from her crime scene, was entered into the DNA lab in 2001 under Ciara's case file number, and was not corrected until 2003.
A photograph of AJM40 and AJM48 being received by a lab in the UK in 2008.
Mr Yovich has now moved to asking Mr Egan about the documentation he found in relation to the state's most critical exhibit, Ciara's left thumbnail - AJM40.
Mr Egan has agreed from all of the Pathwest documentation, the only description of the exhibit was 'debris only, not suitable for analysis' which was noted in 1997 and 2003 by Pathwest scientist, Aleksander Bagdonavicius.
There was no evidence the yellow top container it was housed in from the post-mortem was ever opened until it was flown to the UK in 2008 and the breakthrough DNA match to Mr Edwards' profile was made.
Mr Egan said the only documentation he found related to the exhibit's arrival in the lab, its location within the lab's storage area and when it was transported to the UK.
Mr Yovich: You don't know what processes were undertaken [to come up with the description] because there's no note beyond that?
Mr Egan: I don't know what was done in 2003 to come up with that conclusion.
Mr Egan said his review of AJM40's documentation showed no documentation relating to any examination or testing of the sample.
Mr Yovich has begun asking if there was no documentation of the sample being tested, how any quality issues could be noted.
Mr Egan: If no examination was done, how do you bring up a quality issue about something that didn't happen?
Justice Stephen Hall has interrupted Mr Yovich's line of questioning to warn him his question is based on a hypothetical, and is ignoring the previous evidence of Mr Bagdonavicius who has already explained how he decided the container contained 'debris only'.
"You seem to be putting a question that is hypothetical in circumstances where we know in fact what happened ... so I don't know what value it has," he said.
Mr Yovich has changed his line of questioning to ask Mr Egan if he felt Mr Bagdonavicius' notes on his review of the container in 1997 and 2003 were adequate.
Mr Egan has said Mr Bagdonavicius could have been more thorough.
"I think Mr Bagdonavicius could have made further notes to assist the process, that would have been helpful," he said.
Mr Yovich has moved onto the 28 quality issues Mr Egan identified in relation to the Pathwest testing of the 17,000-odd exhibits relating to the Macro Taskforce over more than two decades.
A quality issue includes paperwork errors, - such as wrongly identifying an item or batch number or wrongly informing police an item had been tested when it hadn't - manual handling errors - such as lab spillages - and contamination incidents.
Mr Egan has revealed 9,000 people had their DNA taken to obtain a 'reference sample' throughout the duration of the case.
The remaining 8,000 items tested in the lab related to other aspects of the cases.
Mr Yovich is now going through a document which lists the quality issues.
"So on 10 different occasions identified within the quality issues system that involved contamination, nine were by staff members and one by another sample," he said.
The contamination events involved those listed in the table at the bottom of this post which had already been detailed during earlier evidence, plus the following:
Mr Yovich also summarised some of the other quality issues noted.
"The incidents also include wrong samples being attached to reference samples and a particular manual handling error ... five tubes accidentally being tipped over during an extraction process and your notes say this occurred when an operator was changing gloves between samples," he said.
Mr Yovich has now referred to another quality issue involving one of Mr Edwards' rape victim's intimate swabs being wrongly labelled as urine when it arrived at the lab.
The swab is not critical to the state's case, however, Mr Yovich has noted the quality issue was not picked up until recently, and is in addition to the 28 other issues.
The list of quality issues also does not include the four negative control blanks that were found to contain female DNA when tested in 2004 in a New Zealand lab.
Mr Egan said these contaminations related to AJM41 and AJM46 (Ciara's left and right index fingers). Only one could be confirmed as having definitely occurred within the Pathwest lab.
He said the incidents were not included on the quality issue list as the fingernails were tested for low copy number DNA testing in the Pathwest lab in 2003, when the testing was not accredited, and wasn't being relied upon.
Mr Yovich has pointed out the samples and extracts were then, however, sent to New Zealand in 2004 for further testing, and if any result had been recovered during that testing, it would have been relied upon.
While the exhibits recovered no male DNA, Mr Egan has agreed.
It will resume at 2.15pm.
Mr Egan is explaining that while he worked at times on the testing of Macro-related exhibits from 1996, he did not take over the role as head of the Pathwest cold case team until 2015, a year before Mr Edwards' arrest.
He said at that time, the case had "70 or 80 lever arch files" of documentation on book shelves.
He has agreed the documentation was predominantly arranged in the order of when batches of exhibits were received into the lab, rather than by individual exhibit which sometimes made it more difficult to track all the documentation relating to an item if it had come and gone from the lab, and been tested within the lab, on multiple occasions.
"The cases were individualised to the victim," Mr Egan said.
"A lot of the DNA documentation for disclosure had to be found from the hard copies that had been archived."
Mr Yovich has moved onto asking Mr Egan about how all the DNA testing paperwork would be filed for an exhibit.
Mr Egan has said the different documents relating to the DNA examination of an exhibit would be compiled together only if the case ended up going to trial.
To find a document, a scientist would have to refer to when the item was tested to retrieve the relevant paperwork. A summary of the DNA testing was usually written in the exhibit's case file.
Mr Yovich, during his opening statement for the trial, said there was no documentation that directly explained when a contamination opportunity existed for Mr Edwards' DNA to make its way into Ciara's fingernail exhibits.
He has since sought to uncover errors made in lab paperwork and testing, in an attempt to show its possible the opportunity may not have been documented.
Mr Yovich has now asked Mr Egan about DNA technologies in 1996 and 1997 often needing the biological material to be visible for enough material to be extracted for a DNA profile.
Mr Yovich: The [anti-contamination] measures you needed to take to avoid cellular material going from one place to another could rely on that limitation?
Mr Egan: Well we would do a lot of cleaning, whether we saw a mess on the bench or not, it was standard protocol to clean, clean, clean ... [and] we changed our gloves between items.
Mr Yovich is now asking Mr Egan about his memory of the Macro-related work carried out at the lab over two decades.
Mr Yovich: The cases you are giving evidence about today perhaps stand out more than others because of the subject matter, because of the length of time? Have you ever had to give evidence on events happening 20 years ago in a case other than this?
Mr Egan: Yes, being on the cold case team ... I have given evidence in these types of cases.
Mr Yovich: Is your evidence heavily dependent on the accuracy of the documents you have looked at?
Mr Egan: I think that's fair to say, yes.
Mr Egan has agreed the many documents relating to the Macro case could have been organised better.
Court has adjourned for morning tea.
Defence counsel Paul Yovich.
Mr Yovich has begun his cross-examination of Mr Egan and is asking him what an accreditation assessment involves.
Mr Egan said the lab receives a surveillance visit around once every three years which lasts around one to two days.
The visits review some of the lab's reporting in relation to a number of police cases it's involved in to ensure the accuracy of reporting.
Mr Egan has agreed the assessment is limited in that it involves "having to trust the notes" created by Pathwest scientists, and does not include independent assessments of any contamination events.
Prosecutor Carmel Barbagallo has resumed asking Mr Egan questions.
She has asked about a sperm cell extract known as 11J7, taken from a rape kit swab of Mr Edwards' 1995 rape victim.
Mr Egan has confirmed that the extract was the only extract created in the Pathwest lab that contained Mr Edwards' DNA prior to the 2008 discovery of his DNA profile under Ciara's fingernails.
It was created in February 1996, a year prior to Ciara's murder, and was tested twice in September 1999.
Mr Egan said it remained in storage between 1999 to September 2008.
Ms Barbagallo has completed Mr Egan's evidence-in-chief.
Justice Stephen Hall has asked Mr Egan to clarify whether the lab's accreditation included the assessment of its contamination protocols, which he has confirmed it does.
Pathwest forensic scientist, Scott Egan Credit:ABC Perth
Welcome to WAtoday's coverage of day 56 of the Claremont serial killer trial in the Supreme Court of Western Australia.
Today, Pathwest forensic scientist Scott Egan will continue to give evidence for a fourth day as the state looks to wrap up its DNA evidence in the coming week.
It is expected defence lawyer Paul Yovich will begin his cross-examination at some stage today.
Bradley Edwards has pleaded not guilty to the murders of Sarah Spiers, Jane Rimmer and Ciara Glennon.