Toxicity is nothing new in League of Legends, but the awareness regarding this subject recently rose within the community, following statements of several prominent members.
Riot Games weren't slow to answer the controversy — and they promised us to improve the current reporting system. Whereas it is by notifying players that their reports lead to a punishment, or by better detecting intentional feeding or AFK, Riot Games explained that several things could be tweaked to improve the overall matchmaking experience.
They decided to focus first on something we've been asking for for years already: the possibility of muting and/or reporting players during the champion selection.
Although this new functionality sounds interesting, it won't be implemented immediately. Patch 1.13 and 1.14 cycles will be used to test the tool in North America then Korea. Data collected from these two testing phases will help improve the current system before it gets implemented in other regions.
Although you should be able to report players during the champion selection, it would be really surprising to see an immediate response from the support. In other words, reporting a player in champ select won't prevent the game from starting anyway...
Original content by "Antagoniste".