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when there is already a known standard treatment. The whole point of the article cited in this piece is that the ethical standard is to compare known standard treatments against new ones, not placebos against experimental drugs. People are getting away with a different standard by conducting trials in the developing world (or, in this case, on poor women in Texas - which might as well be the developing world, depending on who you are/where you live). Their consent to receive a placebo is not the issue; the issue is that they should have been given either the standard treatment or the experimental one - not a placebo at all.