If more people read the Controlled Substance Act pertaining to steroids, you'd learn that your allowed to bring 50 dosage units across the border with you on the way back as long as you properly declare them just like you would food.
But for those of you who have not read it here is the paragraph:
DEA Controlled Substance Act 956 A
Individual possessing controlled substance
"Notwithstanding any exemption under paragraph (1), a United States resident who enters the United States through an international land border with a controlled substance (except a substance in schedule I) for which the individual does not possess a valid prescription issued by a practitioner (as defined in section 802 of this title) in accordance with applicable Federal and State law (or documentation that verifies the issuance of such a prescription to that individual) may not import the controlled substance into the United States in an amount that exceeds 50 dosage units of the controlled substance."
Steroids are a schedule 3 drug. You cannot exceed 50 dosage units, which equals 50 individual pills, or 50 ML or liquid steroids.
However, state law prohibits you from possessing steroids at the same time. Some people say, well they'll just wait for you outside the border station. Very incorrect. You can't be searched without a visual reason to be searched. I do buy most of my gear from my doctor or from a domestic source. However there have been plenty of times when I need something to fill in a stack, whether it be an extra bottle of Test, or a container of Nolvadex, and I drive the 45 minutes from Tucson and go pick it up.
I walk up to the border station, when they ask if I have anything to declare, I show them what it is. They study the bottles and look at their charts to see if I'm under the dosages allowed, and I am on my way.
Most will not use this law to their advantage because they don't have to. It's easier to go with a domestic source, no doubt. But the option is there.
I'm sure someone will say, "This guy's an idiot, you can't do that." Well here is the DEA website link. Read it and show me a GOVERNMENT law that says otherwise.
http://www.dea.gov/pubs/csa/956.htm#a