If you think about it, it really is not surprising that there is so little information in the medical and scientific literature.
Studies come in variety of types. The best are double blinded controlled experiments. Any studies that involve human subjects must be approved by a panel of ethicists and get funding. It is next to impossible to design a study that involves giving ANY substance to pregnant humans (for this to even be considered the hypothesis would have to be that the substance was beneficail). When these kind of studies are impossible, information is gathered in case control studies. In other words, woman who have used drugs during pregnancy are compared to those who have not. Accurate results would require that both groups of woman give accurate and honest histories regarding their drug use. Both groups would have to be large enough (hundreds or thousands) to show a difference in the rate of rare occurances betweent the two groups to satisfy the statisticians. One could easily argue that research dollars would be better used on just about anything else and that common sense should be enough to know that taking illicit drugs are likely to impare your ability to be a good parent before or after birth.
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I was there to see beautiful naked women. So was everybody else. It's a common failing.
Robert A Heinlein in "They Do It With Mirrors"
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