Inside the landfill hunt for missing Brisbane teacher

When retired teacher Lesley Trotter stepped out of her Toowong unit on March 28, she did not return. Within days, Queensland Police would form a theory: she had been killed, her remains concealed in a wheelie bin, then swept up in the city's waste stream and transported to a landfill on the outskirts of Ipswich.

By this week, that theory had moved investigators to attempt something seldom done in Australia — a hand-sorted search of 3000 tonnes of refuse, sift by sift, in hopes of finding her remains.

Ms Trotter, 78, left behind a mobile phone and wallet in her unit. Her car remained in the garage. No sign of foul play appeared at first, but investigators quickly became convinced that the circumstances pointed to something darker: a crime committed on the night she vanished, followed by a deliberate attempt to dispose of the evidence.

The theory of a wheelie-bin disposal proved actionable. Police narrowed the search to the Swanbank waste management facility near Ipswich — one of two landfill sites where waste from inner Brisbane is sent. The preparation alone took days. The area to be searched was enormous: roughly 3000 tonnes of general waste compacted into the facility's sprawling footprint.

On Tuesday, the actual search began. Detective Superintendent Andrew Massingham laid out the challenge facing his teams. "This is very much a hand-and-eye type search," he said. "Using rakes and indiscriminate-type equipment to sort through the general waste."

The method is labour-intensive. Waste is exhumed from the landfill, then tipped into shallow trenches — 30 centimetres deep — where investigators can examine it methodically. The plan calls for processing roughly 200 tonnes a day, weather permitting, though the full search could stretch three weeks or longer.

The effort is not without precedent — landfill searches have been mounted before in missing-persons cases — but the sheer volume and the hand-labour requirement underscore the stakes. Each tonne of refuse becomes a potential repository of clues, and the risk of overlooking something is constant.

By Thursday — three days in — the search yielded its first significant find: several items of interest at the facility. The discovery offered a flicker of hope that the theory was correct, that investigators were searching in the right place.

But preliminary examination proved sobering. Police confirmed that the items were not related to the investigation into Ms Trotter's disappearance. The search would continue, undimmed but with the initial lead exhausted.

For the families of missing persons, such moments are a familiar pain. They offer a moment of possibility before closing it again. The search at Swanbank persists, with no timetable for closure and no certainty that traces of Ms Trotter will be found at all.

Police said further updates would be provided as the investigation develops.