I used to brew beer. I'd go to the UK every few years and would invariably literally smuggle beer-making kits with real hops, yeast, and so on into the USA.
I almost got caught in 1994. We landed at Houston and were met by a USDA beagle. He was sniffing everyone's luggage as they stopped at Customs. The beer-making kits I had contained really strong-odored hops. I could smell them stored in my carry-on even while in the overhead bin on the airplane.
I lucked out. The beagle went nuts on a guy's bag that was three people ahead of me. I mean, it really went ballistic. The USDA agents all came running and they started ripping open the guy's big suitcase right there on the floor. As all this went on, I quickly sneaked by. Turns out, the guy had ten pounds of British bacon wrapped in foil...a big no-no.
My troubles weren't over, however. The DEA had a basset hound doing random sniffs of bags at the next station. I was smuggling about 150 tablets of over-the-counter Vicodin. Lucked out with that one, too.