DNA experts say “Y-STR” DNA analysis has been around for about five years and is most useful when there is a mix of male and female DNA.

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An “STR” analysis – or short tandem repeat analysis – is a common type of DNA profiling in criminal cases and other types of forensic cases, according to the National Institute of Justice.

Y-STR testing, which can target trace amounts of male DNA, has been used in NSW since 2009 and been available in ­almost every lab in Australia for at least seven years. Queensland’s government ...