George Karl sticks with stance that NBA has PED problemFormer NBA head coach George Karl explains why he believes some basketball players are on performance enhancing drugs.SI Staff|Share on FacebookShare on XAdd us as a preferred sourceFormer NBA head coach George Karl explains why he believes some basketball players are on performance enhancing drugs.Loading recommendations... Please wait while we load personalized content recommendationsPublished Jan 11, 2017 | Modified Jan 11, 2017SI STAFFShare on FacebookShare on XHome/NBA