I'm not entirely convinced. Ortiz has looked substantially smaller at the plate (although supposedly he's the same weight). In 2008, Ortiz was underperforming because of his wrist injury, in 2009, he slumped the first half of the year, and then exploded. This year, he looked outmatched at the beginning of the year and exploded again. I also think Ortiz values his reputation in Boston. What they did in 2004 meant so much, and the steroid allegations against him are bad, but not Clemmons/Bonds bad. If he's caught again, he'll be the shame of the city.
I'm not necessarily saying he isn't juicing, I just think that whatever his steroid use has been--yes or no-- its been consistent, and that you can't necessarily blame good or bad years on varied usage.