Toxic Behavior and Hextech

Please, do not simply downvote and flame. I am trying to encourage genuine discussion.

I know you don't want to give loot to toxic players. This isn't a QQ thread because I rendered myself ineligible for loot, but what guidelines are there as to when a player is counted as "reformed" and able to get loot again? This is a question I'm sure many people want answered. While on one side it might encourage people to reform only until this point where they earn loot again and then be toxic again, on the flipside it also allows players who made a mistake and engaged in toxic behavior to actually know that their efforts at reformation aren't in vain. Granted, you shouldn't be non-toxic just for rewards, but I think some sort of guidelines or protocol should be established.