In 2000, the Ministry of Health’s Cancer Plan established the nationwide rollout of a screening program that had already been launched in 32 departments since 1994. In 2003, 46 new departments joined the national program, and by March 2004, all metropolitan departments were covered (with the overseas departments to follow in 2004). The new guidelines for cancer screening programs, published in 2001, aim to retain the benefits of the previous guidelines while addressing all the criticisms raised by women and physicians. They have been adapted to existing breast cancer screening practices in France and offer a service similar to that of screening based on individual prescriptions. The screening mammogram procedure, coded ZM41, is free for women aged 50 to 74. This code, created in 2002, covers two views per breast, any repeat images that may be necessary, as well as, if applicable, additional views and enlarged images. Ultrasound and fine-needle aspiration are part of the complementary diagnostic workup and are the responsibility of the woman. The radiologist who examines the woman and reads her images immediately is called the first reader; the one who “re-reads” the first reader’s normal images is called the second reader. The objective of this study was to assess whether the rapid implementation of the program across the entire country had been carried out in accordance with the new specifications.