Chick has a script... from 10 different doctors 
Which means he's breaking the law... doctor shopping is illegal. Really, there's no way to legally do the dosages IFBB pros have to in order to compete. These guys that say they "have a script" are still breaking the law. The most a doc can really prescribe for HRT purposes is 100mg-200mg/wk or so, if you can even find one who will give you injectible test instead of androgel, so these guys are doing one of three things:
1) Doctor shopping - 10 docs giving a 100mg/wk script for 1000mg/wk total. Illegal.
2) They go to one doc and get a script for 100mg/wk, then buy another 900mg on the black market, but wave around the script thinking it will protect them. Illegal.
3) They actually find a doctor who will prescribe 1000mg/wk. This is highly unlikely, as no doctor is going to risk his medical license to prescribe illegal amounts. But, since there is no recognised medical protocol for prescribing anywhere near that much test, if a doctor does it for recreational/sports performance reasons that makes the script not legally valid, which makes posession of the meds illegal as well.
Whichever of the three methods the "I have a script" guy employs, he's still breaking the law, whether he's getting away with it or not.
There is one legal way to do IFBB-pro level drugs: Live in San Diego, drive to TJ a few times a week, and inject over there carrying nothing back across. Not the smartest way to go about it, but you wouldn't be breaking US law.