'I have nothing to hide,' farmer interviewed about Mollie Tibbetts says after refusing FBI's polygraph request

'I have nothing to hide,' farmer interviewed about Mollie Tibbetts says after refusing FBI's polygraph request  DesMoinesRegister.com Mollie Tibbetts' father: 'We can get her home'  ABC News Pig farmer questioned over missing student reportedly refuses to take polygraph test  New York PostFull coverage

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