DNA matching a teenage boy accused of raping and murdering a six-year-old girl was found on her body and clothes, a court heard.
Giving evidence at the High Court in Glasgow, forensic scientist Stuart Bailey said DNA found on eight areas of Alesha MacPhail's body, as well as on her shorts and vest, is more than one billion times more likely to be from the accused than someone unrelated to him.
This could be explained by the 16-year-old, who denies the charges, coming into contact with these areas of her body and clothes, the court heard.
He said an explanation for this was intercourse but the defence suggestion that the accused's semen was "planted" there was scientifically possible.
Questioned if the accused's DNA could have been found on Alesha though secondary transfer from a third party, Bailey said: "I can't rule it out but I find it highly unlikely given the amount of DNA attributed to [the accused]."
The teenager denies abducting, raping and murdering Alesha, and attempting to hide evidence on the Isle of Bute in July last year.
The case continues.
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