Your editorial on Jeff Sessions turning back the clock on marijuana ("Don't let Sessions turn back the clock on medical marijuana," Oct. 13) is puzzling to me as a scientist, as I have long viewed the medical marijuana movement to be turning back the clock on FDA protections. For example, did you know that Maryland has the dubious distinction of being a state (the only state as far as I know) to allow nurse midwives to recommend marijuana to their patients? The American College of Obstetricians and Gynecologists have come out with a position paper against marijuana use in pregnancy based on available data, but no national association of nurse midwives has done so, thereby making it clear they must be unfamiliar with the relevant scientific publications. If Jeff Sessions thinks marijuana might be harmful for the developing fetus, he is taking a stand on the side of science, not against it. Both human epidemiological studies and laboratory studies of animals indicate marijuana use during key points of fetal development can have lasting consequences, some of which are not obvious at birth yet become apparent later. Marijuana may ease morning sickness, but at a cost.