Jharkhand Chief Minister Raghuvar Das imposed a ban on the sale of thermocol plates in the entire state to promote leaf plates. He said Friday that it would help generate employment for the poor and tribal, who are engaged in making leaf plates. The Chief Minister, who is on a two-day visit to West Singhbhum district including naxal-affected Saranda, also announced one lakh rupees to the villages which become liquor-free.