LYCOS RETRIEVER 
Steroids: United States
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Steroids vary by the functional groups attached to these rings and the oxidation state of the rings. Hundreds of distinct steroids are found in plants, animals, and fungi. All steroids are made in cells either from the sterol lanosterol (animals and fungi) or the sterol cycloartenol (plants). Both sterols are derived from the cyclization of the triterpene squalene.[1]
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For purposes of illegal use there are several sources; the most common illegal source is from smuggling steroids into the United States from other countries such as Mexico and European countries. Smuggling from these areas is easier because a prescription is not required for the purchase of steroids. Less often steroids found in the illicit market are diverted from legitimate sources (e.g. thefts or inappropriate prescribing) or produced in clandestine laboratories.(11)
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The operation grew out of a massive bust in Mexico in 2005 known as Gear Grinder, which took down eight Mexican steroid producers credited with supplying more than 80 percent of the illicit steroids in the United States. That bust, Simmons said, pushed virtually all of the remaining U.S. steroid business to China.
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The Mitchell Report states Brian McNamee injected Roger Clemens with steroids and human growth hormone at least 16 times from 1998 through 2001 when Mr. Clemens pitched for the Toronto Blue Jays and New York Yankees. Read More
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