TikTok was aware that its design features are detrimental to its young users and that publicly touted tools aimed at limiting kids’ time on the site were largely ineffective, according to internal documents and communications exposed in lawsuit filed by the state of Kentucky.

TikTok's executives and employees were well aware that its features foster compulsive use of the app, as well as of its corresponding negative mental health effects, according to NPR. The broadcasting organization reviewed the unredacted documents from the lawsuit filed by the Kentucky Attorney General's Office as published by the Kentucky Public Radio.

Just days after multiple states sued TikTok for allegedly designing the app to addict children, new details have emerged about how they say the company does it. Jo Ling Kent reports.