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Texas executes more people and locks up more offenders than anywhere else in America. But now this conservative state is the unlikely centre of a rehabilitation-led revolution in prison reform that's sweeping through the US. Crime is down, prisoner numbers have fallen and on top of this - they've cut costs. Could there be lessons for other countries? The United Kingdom has the highest imprisonment rate in Western Europe. Panorama joins Michael Gove - the man in charge of British prisons - on a fact-finding mission to Texas.