IMO, I think pro doesn't use more than 1g of test a week (of course some maybe more and other may be less)
What's the difference between pro and amateur is the amount of GH they use. Pro use tons of GH and can afford it. For an amateur it's harder.
To be a pro bodybuilder you need a lot of money and a good dealer with legit human grade stuff.
When I was in Venice gold's gym I heard lots of weirds stories about bodybuilder doing some weirds stuff to get money or to get steroids or hormones. I don't know if it's true but it's probably.
A.