Discarded shoe linked to Ffion murder scene; Tiny shards of plastic found on trainer and near body.
Victim... Ffion Roberts A PIECE of plastic found near the spot where the body of Ffion Wyn Roberts was found was similar to one found on a discarded trainer a mile away.
Ffion, 22, was found dead in Y Cyt, a drainage ditch at Porthmadog, last April.
Wool packer Iestyn Davies, 54, of Porthmadog, denies murdering the care worker and is on trial at Caernarfon Crown Court.
Dr Lorna Dawson, of the Macaulay Institute in Aberdeen, told the jury samples of soil from tracksuit trousers and a trainer found near tidal gates about a mile from where Ffion's body was found, were examined along with soil samples from where the body was discovered.
She said the trousers and trainers were heavily soiled and the plastic shard was found in flakes of soil taken from the outer side of the trainer.
"This was invisible to the naked eye and is very distinctive with yellow and black colouration," she said.
Soil samples from the area where Ffion was found were checked and a similar plastic shard was found. Soil from the tidal gate area revealed no plastic shards.
She said the soil from the tidal gate area was finer in texture than the soil found where the body was found.
"The soil at the tidal gate is more of a silt whereas the soil at the other site is coarser in texture and is a sand," she added.
She described her findings based on the soil found on the trousers as "moderate" evidence. Combined with the plastic shards found on the shoe she said that evidence was "moderately strong".
Dr Dawson concluded the soil from the two items examined did not come from the tidal gate area and was consistent with having come from the area the body was found in.
Cross-examined by Patrick Harrington QC, defending, she said it would have been preferable to have more soil samples to test.
"The plastic shard found was all the more reason for more samples to be tested," he said.
The trial continues.
A shard of plastic removed from the trainer was similar to one found near the murder scene Trainer found at sluice gates about a mile from the crime scene