Pisa explained: "I've now spoken to an ex-British Army officer who found some sunglasses up there. He was asked not to put them in a plastic bag because of humidity, but to wrap them up in tissue paper, which he did.
"He handed them in and he had to give DNA and his fingerprints. The question is, are they connected to Jay?"
When asked by host Bev Turner what he believes happened to Slater, Pisa added that the mobile phone's ping location could only be possible "if the phone was thrown" into the terrain.
He continued: "We're not obviously being kept up to speed, but he did tell me that he thought where the pin came from was rather surprising because it was really steep to get to, and it was covered in undergrowth and cacti.
The 19-year-old British teenager has been missing on the island of Tenerife for 18 days
www.gbnews.com