dude, riot is connected to the PCs of players during the matches after elimination lively. since the last 8 of vct challengers' first week, riot checks all of the players with not only vanguard but also additional softwares. even their client for tournament is different from usual players.

also riot really catches anything wrong. check for nisay: https://www.vlr.gg/player/545/nisay
according to the roomers, the illegal third party software was in his mouse's chip. he is banned from official tournaments for 12 monhs.
riot catched even this.

so, don't worry about cNed :)