OK folks..
1) I'm not a cop, if I was I couldn't write what I just did
2) I Live in Tucson and travel to Nogales, Mexico every weekend.
The DEA link concerning this matter can be found here:
http://www.usdoj.gov/dea/pubs/csa/956.htm#aYou can, legally and without a prescription, bring back up to 50 dosage units (in the case with steroids, a dosage unit is one pill or 1ml of liquid) across the border IF you declare it, if it is in it's original packaging and sealed.
I know everyone thinks thats ridiculous but here's the catches.
1) Schedule 1 drugs are excluded, steroids is not a schedule 1 drug.
2) You MUST declare it. In other words, if they ask you if your bringing back anything, and you say "no" and are searched, you will be fined for not declaring chemical substances.
3) Yes, if you get pulled over on the way back and for some reason are stupid enough to deserve a car search, you are subject to Arizona laws in my case.
4) The drugs must be for personal use, which is why it's up to 50 units. Your not a drug dealer in their minds if you bring back 50 pills of vicodin.
How it SHOULD work:
You walk up to the agent by your turnstyle, and he says "Citizen?" or "Do you have anything you wish to declare?" At that point you'd say yes if he asked and produce your substances for inspection, and then will be able to pass.
How it ACTUALLY works: If they have to ask, and you have to take it out of your pocket, it's 75/25 that you'll be able to keep it. If you don't readily show them (under your own power) they can see that as you trying to smuggle. I made that mistake the first time and had the stuff confiscated. At this point I was told how to properly declare it. I went back literally right away, bought my 5 vials of Test E (50ml total) had them in my hand when I walked into the station, declared them without them asking, and was waved on.
At first glance you'd think this is not legit, but again the link this particular part of the Controlled Substance Act is:
http://www.usdoj.gov/dea/pubs/csa/956.htm#aThe Reason why it was created and why not many people know it:
Wal Mart last year came out with a new clause saying by rule they will not prosecute someone caught shoplifting under $25 for the sole purpose that it's useless for them to do so. The Border Patrol is now basically doing the same thing by saying, "If you want it for yourself, fine. But we're going to crack down on the dealers trying to come through."
Again, before you call me or the originator of this post a moron, go to the official DEA website and read it for yourself. And you'll understand why my bathroom may as well be an Organon lab