A digital device seized from Delhi excise department led the CBI to unearth the alleged role of Deputy Chief Minister Manish Sisodia in the liquor policy case, sources from the agency have said. Mr Sisodia was arrested by the CBI last night following an eight-hour questioning session.He is to be presented in the court this afternoon. The senior AAP leader faces corruption allegations in bringing a now-scrapped liquor sale policy in the national capital. The party has denied the charges, alleging political vendetta by the BJP-led central government.