'Powell released the following statement: "I was disappointed to recently find out that I had mistakenly used a product that caused a positive result during testing. Although I'm frustrated with the result, I've accepted the league's discipline of a four game suspension. I apologize to my teammates, coaches, the entire Bills organization and the Bills fans for my mistake. I will continue to give the Bills my best effort every day, and help contribute to a successful 2017 season."'