How do you know? Are you his prep coach? ![Huh ???](http://www.getbig.com/boards/Smileys/classic/huh.gif)
You don't know but many do. You can sort of guesstimate just based on pictures if you've seen enough real world application.
It's at least 4 grams of AAS, probably at least 12iu of GH and plenty of insulin. So yes, "juiced to a high level."
There are some individual variations but there are some constants, things like "high" testosterone doses among the heavyweights. Meaning no one does less than a gram and some do several. High testosterone is the base in almost everyone's cycles, then the other compounds are added on top.