I never bought the "I didn't know it was banned" explanation with any PED users and I don't plan on starting with Knott. As a professional athlete you just have to know what's going into your body.
This.
Most guys are juicing. Most guys know how to get away with it. When they get caught, they blame it on the manufacturer. Rinse, clean, repeat.
I don't even take the apology seriously when they blame it on the manufacturer, it is really an insult to our intelligence as fans. We know better, just admit you tried to cheat to get ahead and apologize for that.
Don't get me wrong here, I still love JK and hope has a successful career.