Police read a statement from Miss McGrath's parents, Christine and Joe, and the rest of the family. "We would like to express our thanks to Detective Superintendent Jeff Hill and all of the current members of his cold case team for their hard work, dedication and professionalism."
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The mother of missing RAF Serviceman Corrie McKeague says she "now knows" that her son is not in a Cambridgeshire landfill.
Officers say they are 'content' Corrie is not in the landfill areas which have now been searched.
ITV News Anglia was given access to police teams trying to curb the supply of class A drugs and limit the damage they do.