It was triggered by a pre-existing alert [music] in federal systems flagging writings for possible possession of child [music] sexual abuse material. Under federal border search authority derived from US code titles 6 8 and 19. CBP officers [music] examined writing Samsung Galaxy Zfold 4 smartphone. While their initial alert concerned child exploitation material that specific content was [music] not found. However, during the examination, officers observed something equally disturbing in the [music] phone's gallery folder.