U.S. FDA warning letters have been a staple of regulatory life since the late 1990s, but James Boiani, a regulatory attorney with Epstein, Becker & Green P.C., said it’s no stretch of the imagination that warning letter volumes will jump in 2021. This is to some extent because the volume of warning letters dropped significantly over the past four years, and Boiani advised that all FDA-regulated industries will see more warning letters unless they are communicative with the agency about inspectional findings.