Steroids never left professional sports. They became more refined and harder to detect. The "Steroid Era" in baseball was when the players were taking steroids that produced a massively muscled look and allowed for maximum power, hence the explosion in home runs. Today's steroids allow the pro athlete to achieve a more lean and strong look and are harder to detect. They are also better for sports like basketball, where longer, leaner muscles make for better play. Baseball never got rid of its steroid problem. The sport just learned to hide it better and players now have more 30-40 home run seasons to avoid suspicion. The NBA has also increased its steroid usage because the steroids developed are now beneficial. The old school steroids that made an athlete built like a body builder worked against most players games. All this to say LeBron for sure has done steroids during most of his career.