Finance CBI court issues non bailable warrants against Modi and Choksi Updated : April 08, 2018 05:20 PM IST The agency had written to Modi and Choksi to join probe on their official e-mail ids but they refused. Several bank employees have been booked for collusion in the case. According to the RBI guidelines, LoUs for gems should not be valid for more than 90 days. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.