From the inquest testimony by Detective Chief Inspector David Laidlaw as reported by Caroline Overington, paraphrased by me:
- the police investigation has not ruled out anybody;
- CO: "everything that could have been done to find William had now been done" [though presumably this doesn't mean "done" as in "finished", because the investigation continues];
- police tried to identify every car in the vicinity of Benaroon Drive at the relevant time, using CCTV from Kendall Tennis Club [which in 2014 was on Graham St, Kendall] and footage from cameras on the M1 [the highway running north/south past Kew], and talking to the owners of vehicle number plates;
- police added William's DNA profile (created from his toothbrush) to the Missing Persons database "which performs a continuous, looping search of all available records";
- police lodged photos of William's face (as it was when he went missing, and as it might look today) with international agencies that continually "scan and search facial images across all media — football games and airport terminals, to use some examples";
- police used facial recognition technology to search the Border Force database to see if an Australian passport "has ever been issued featuring the image of a child that might be William", with no result [but presumably William would have needed a passport for the foster family's trip to Bali, so I suppose that didn't count];
- police ordered a tower dump of all mobile phone data from the Telstra, Vodaphone, and Optus towers in and around Kendall on the morning William went missing [for an explanation of tower dumps, here's a good 2014
article by the Sydney Morning Herald];
- the $1 million reward still stands.
[Note: notes in square brackets are by me, stormbird]
From:
A sister's devotion must drive us to find William Tyrrell, The Australian, 09 Oct 2020 (posted earlier by drsleuth,
thread 56, post 511)
The Australian doesn't seem to offer sample articles for non-subscribers any more (or not for me) but I was able to access the article via a post on Bring Little Spiderman William Tyrrell Home, a public Facebook page (where posts are visible to non-Facebook members): the post starts: "A DNA profile of William has been created..." and the link has the title "We can't leave this to a 10-year-old to solve".