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For instance, LGC is advising the UK government and working on DNA methods to identify foods containing the four insect species allowed for sale for human consumption.
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For well-distributed points, nearest neighbor search is often near O(logn)O(\log n)O(logn) in practice. In the worst case (all points clustered tightly or along a line), it can degrade to O(n)O(n)O(n), but this is uncommon with typical spatial data.