 Palmeiro has steadfastly maintained his innocence in the steroid controversy, stating that he must have tested positive due to a tainted B12 injection.Ongoing debate about the influence of steroids on the game in the 1990s was widely believed to have affected the vote totals for several power hitters on the ballot, including McGwire, Bagwell, Walker and Gonzalez, regardless of whether they had ever tested positive for steroid use or had even been accused of involvement with steroids; the top five vote-getters were either pitchers or middle infielders with relatively few home runs.Walker's candidacy was also affected by voters' assessment of his extreme home/away statistical splits, attributed by many to the fact that he spent slightly more than half his career with hitter's paradise Coors Field as his home park, though he also spent several years playing in the more pitching-friendly Olympic Stadium.