Business Pharma firms troubled by US FDA warning letters; data integrity issues worry industry, investors Updated : July 17, 2019 02:58 PM IST The USFDA warning letter to Strides’ Puducherry plant points to lack of data integrity. Four listed companies have received warning letters in the span of five months. 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.