An alleged scam involving the purchase of substandard zinc sulphate fertiliser worth over Rs 40 crore from a Madhya Pradesh-based firm has surfaced in Haridwar. The office of the chief agriculture officer (CAO), in response to a Right to Information (RTI) application, said that a crucial file containing a laboratory report on the fertiliser samples was never received from the sub-divisional magistrate (SDM) of Roorkee.