The EU-approval of the pesticide chlorpyrifos was based on one single study concerning possible damages on the developing brain, commissioned by the producer Dow in 1998. Dow has been asked to provide a new study on developmental neurotoxicity, but rejected to comply.

By Nils Mulvad and Staffan Dahllöf

A spokesperson for EFSA (European Food Safety Agency) says to Le Monde:

“We can confirm that during the evaluation of chlorpyrifos in 2013 the only one available study on developmental neurotoxicity (DNT) was from 1998 and had several limitations (e.g. lack of findings in the positive control, exposure period from gestational day 6 to lactation day 11 (instead of 21), lower number of individuals for neuropathology (6 instead of 10) and for learning and memory (8 instead of 10), etc.).”