DeMarvion Overshown's penalty raises question of whether Cowboys have discipline problem

FRISCO, Texas (AP) — DeMarvion Overshown said he didn't know inactive players in street clothes couldn't run on the field to celebrate before committing the 14th and final penalty by the Dallas Cowboys last weekend.Whether the linebacker nursing hamstring and back injuries should have known — and whether it's emblematic of a discipline problem under Brian Schottenheimer and his staff…