Straw...
Aconite:No, Mexicans use opium. Straw is atime consuming and exacting process. You can get a raw and highly impure product from a simply extraction but it would not satisfy many experienced users. The correct method ifs the Hungarian alkaloidal concern method [Kabay].
As for "Homebake," it has been done to death here as well as on the net at large. Briefly for the uniniated...Codeine is isolated from otc preps, converted to morphine, and then acetlyated to heroin. There are a couple of variations for all the steps but it is a simple and effective process...Still, I would rather just have some powder, as would most New Zealanders I suppose. UNODC has a couple of great papers on it, N.Z.'s "Clan Lab" project has some as well. Rho has some repeats but also has a couple of hard to find sheets on it also. If you search and still have trouble, let me know.
J.Dizzle: About the DEA's stats. Do not pay them much mind. First, they only sample about 8 to 12 samples in any one market. Second, they do not use scientific methods ffor sample collection so they do not ensure a random poll. They use c.i.s to buy, and c.i.s tend to go the easy route. It is safe to assume that most samples are coming from one dealer, or at most one block.
JRAshroom: "Chiva" isa Mexican Spanish slang word that means "sheep," as in the animal. They use it only for "Tar," not poweder. Powder is called ,"la morena" [the brown girl], or simply "polvo" [powder].
To the last 2 names above: You can convert "Tar" to powder rather easily, as well as adulterate it without converting it to powder. I have outlined both methods in this forum in the past. If you are interested, simply use the search feature. One thing to remember, you can insufflate simply by heating it in just enough water to dissolve, stopping just prior to a boil. then, use a syringe sans needle and inject it into your rectum. you CAN use your nose but it is much more effective via the back. In fact, doing it that way via the nose has its won slang term, "shebanging."
WhoMe: 6-MAM is not more potent than heroin, but it significantly more potent than morphine. It is a metaboilte, as well as a byproduct.
"Acetyl codeine." Almost all illicit heroin has it. The percentages are not dangerous however.