The defence has opened its case in the trial of the man accused of raping and murdering Christchurch school girl Marie Davis.
The 15-year-old's body was found in the Waimakariri River in April last year.
Christchurch roading worker Dean Stuart Cameron denies the charges.
His lawyers called five witnesses in the High Court at Christchurch on Monday.
Three were neighbours of Ms Davis, a fourth was an associate of a Crown witness and the fifth was a scientist specialising in pollen and spores.
Dallas Mildenhall told the jury of six men and five women that tests of pollen on Mr Cameron's shoes and car found no evidence linking them to the river.
But Dr Mildenhall said it is impossible to test all pollen on a car, so his findings did not mean the car had not been at the river.
The trial will resume on Tuesday when the defence will call its final witness, a pathologist.