The Detroit Lions are struggling on defense, but defensive coordinator Kelvin Sheppard isn't worried about the outside noise concerning his unit. "I couldn't care less about perceptions. I couldn't care less about the talk. It's all poison," Sheppard said in a press conference on Thursday afternoon about the negative view of his defense." Every word of it is poison. The praise is the big poison. It's not the negativity. It all comes in waves, and it's all poison. We have a three-phase team here, and I firmly believe that, and I'm going to stand strong in that belief. And I think it's ultra dis...