During this period Doll wrote to a Royal Commission in Australia investigating whether the Monsanto-produced herbicide Agent Orange, which was used during the Vietnam War, was carcinogenic, claiming that there was no evidence that it caused cancer.
Selama periode ini, Doll menulis kepada sebuah Komisi Kerajaan di Australia yang menyelidiki apakah Agen Oranye produksi Monsanto, yang digunakan selama Perang Vietnam, bersifat karsinogenik, mengklaim bahwa tidak ada bukti bahwa zat itu menyebabkan kanker.