The DITP's Behavioral Sciences department is working with the CNIL to objectivize the impact of the design of cookie banners, the pop-ups that appear when a site is accessed. The challenge: to ensure that citizens' free will is respected, and that regulations on personal data protection are effective. To shed light on the effects of dark patterns on users, studies are based on behavioral sciences. A study involving over 4,000 people was carried out on cookie banners, and the results of this experiment "confirm the considerable impact of banner design on the choices made by Internet users".