tracker

Ten others have refused — including New York, Wisconsin and Oregon, according to a state-by-state tracker compiled by the news site Education Week.

Meanwhile, in Harrogate, North Yorkshire, a restaurant owner turned detective took matters into his own hands after a spate of burglaries by secretly placing a tracker in a wheel of Brie.

Tens of millions of pounds worth of drugs are being wrapped in flotation devices equipped with trackers, allowing gang members in Britain to see where they are, officials say.

You can see the figures for your area in the BBC's housing tracker.

Such trackers, whose batteries can last up to 10 years, have contributed to countless discoveries, many of them surprising, about the behavior and migration patterns of this much-feared predator.