senior forensic scientist for Queensland Health, Amanda Reeves.
She told the court she was asked to test for DNA.
Ms Reeves said all cells in the human body, except for red blood cells, contained DNA although hair could be difficult to extract it from.
She said she received reference samples from Allison Baden-Clay, Gerard Baden-Clay, Geoffrey and Priscilla Dickie, Olivia Walton and from Kerry-Anne Walker. She agreed she later received samples from some of Ms Baden-Clay’s daughters.
She said she received five fingernails from the right hand with the remnants of pink nail polish on them.
Ms Reeves said brown dirt and larvae was present on the nails and she took a swab for DNA analysis.
She said she could build an incomplete DNA profile from one of the nails but could not extract samples from the other four.
“Decomposition is probably a big one, during the decomposition process there are chemicals that are produced that basically interfere with the ability to see a DNA profile,” she said.
She said DNA could breakdown over time, as well, especially if exposed to the elements.
Ms Reeves said “touch DNA” involved transferring DNA to a surface after touching it.
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