From Accuracy in Media, the World Health Organization has approved of using the DDT pesticide to control malaria-bearing mosquitoes, particularly in Africa where the problem is worst.
Michael Crichton has been on a campaign about this for at least a few years. It turns out the hysteria over DDT back in the 1960s was just that. It was not based on scientific evidence. Like other chemical substances the safety or danger of using it may depend on how people are exposed to it. The article says that experiments were done in the 1950s where people ate DDT and showed no ill health effects. I haven’t done a detailed study of it, but inhaling it might be a different matter. As was revealed when the movie “Erin Brockovich” came out, Chromium 6 only causes certain health problems, and only when it is inhaled. When it is ingested (eaten or drunk), or exposed to the skin it causes no ill effects. This is because the negative effects are caused by the chemical’s interaction with certain tissues, not all tissues, in the body.
In any case, it is good to see something that can help be used in a region that has been ravaged by malaria.