A federal appellate court has held that the mother of a drug addict who died after arranging to purchase heroin on the Experience Project website could not hold the company behind the site liable for her son’s death.

The U.S. Court of Appeals for the Ninth Circuit on Tuesday held that The Ultimate Software Group Inc., the company behind the website which allowed users to discuss experiences anonymously over the internet, fell within the broad liability immunity afforded to interactive computer services for user-generated content under Section 230 of the Communications Decency Act. Ultimate Software shut down the Experience Project site in April 2016 citing a lack of resources to respond to government information requests.