Most of the police garments tested came into use after the murders.

Carpet floor fibres from the second floor of The Continental Hotel in 1997 were also tested, and found not to match any of the critical fibres in this case.

Evidence earlier in the trial revealed Ciara placed her jacket on the floor underneath a table at the bar, shortly before her disappearance.

Witnesses said she then wrapped it around her waist as she walked out of the bar to catch a taxi home.

The jacket has never been found.

Mr Powell is now being asked how many vehicle fibres are included in the ChemCentre fibres database.

He has said there were 402 fabric samples from 142 vehicles in the database for car models dated between 1986 and 1996.