Waller has been suspended for at least one year for a second violation of the league's substance-abuse policy, Ryan Mink of BaltimoreRavens.com reports.
Waller was suspended for the first four games of last season for his initial violation, and now he faces a year out of the league for his latest. The 24-year-old will be allowed to participate in preseason practices and games, but his punishment will begin once the regular season does. A sixth-round pick in 2015, Waller caught 10 passes for 85 yards and two touchdowns last season. His absence -- which follows Dennis Pitta's most recent hip injury and subsequent release -- figures to allow Nick Boyle to see more action behind Ben Watson, Crockett Gillmore and Maxx Williams at tight end in the buildup to this season.