Threads containing illegal material are a recurring issue for 4chan's moderation team and global law enforcement.

: Following years of negative press and potential legal liability, 4chan implemented stricter automated hashing filters (similar to PhotoDNA ) to automatically detect and block known illegal images. The "Cp Thread" as an Internet Boogeyman

"CP threads" often appear during "raids"—coordinated efforts by malicious users to disrupt the site or get it shut down by flooding boards with illegal content.