Inspection and investigation rules require security deposits and permit appointment of specialised experts for SFIO functions. Rules prescribe appointment of experts for SFIO functions and set terms of service for the Director, experts and staff, governed by deputation and recruitment rules and allowing contractual engagement. A security requirement for appointment of an inspector ties specified refundable deposits to prior-year turnover, and letters of request under section 217 must be transmitted as specified by the Ministry of Corporate Affairs.