Tommy is obviously correct. He didn't say it was impossible.
The question is would it be worth the trouble to acquire PED's? Most of these guys start lifting in prison, so they aren't up to speed on the "lifestyle", most can barely afford commissary let alone juice.
This. Here's how it works- you want to bring in enough drugs, THAT EVERYONE WANTS, so you can have your own supply to get high and then plenty left over to sell to other convicts to make your profit. No convicts want to buy anabolic steroids. Half the convicts in the joint are drug addicts- they are not addicted to Anavar or Deca.
The penalty for getting busted in the joint with steroids or narcotics is the same. Nobody is going to risk losing their "good time" credits and privileges for anabolic steroids. Nobody is addicted to anabolic steroids- plenty of people are addicted to heroin, meth, Oxy, etc.
In the joint a few ping pong balls filled with heroin and meth are worth THOUSANDS of dollars. A few ping pong balls filled with Dianabol are worth zip.