(TELEGRAPH) — Council leaders have introduced lie detector tests in a bid to catch benefit fraudsters who trick them out of thousands of pounds every year.

The move has already helped anti-fraud officials catch nearly 4,000 fraudsters claiming council tax discounts and saved more than £1,400,000 in four months.

The new hi-tech system – which analyses telephone calls from claimants for signs of stress in their voices – is being run by Southwark Council in south London.

Council bosses have defended its use, saying the town hall is the 13th worst hit by Government cuts and therefore has to take a tough line on fraud.

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