How many games of trolling does it take to be banned.

If a player has an entire match history of afk's, dodges, remakes, and intentionally feeding, how long will it take to get banned?

Because I am looking at a match history where there are only 3 games that he didn't appear to troll. It's full of games where he goes 0/25 or greater and then afk's. SO RIOT

Why does your automated system not catch these people? What possible explanation could you have for a match history of 50+ games of intentionally trolling to not receive demacian justice?

Just for clarity, here's basically his match history summed up.

Scratch that, every game on his match history on op.gg (with the exception of 2 normals games and 1 TT) is debatable trolling. In his last 4 games alone he went cleanse ghost on rammus / teemo. And prior to that he went 4 games of smite ghost nunu when he wasn't the jungler. Prior to that he went 23 games of of ghost teleport, stoneborn pact on zilean where his best score 1/9 and his worst was 0/25.

You have to go back 51 matches to find a game where he did well and it looks like he tried. He has 17 remakes because of him, 30 games with no kills, and too many games for me to care to count where he's builds partial items. (zeal + poachers dirk + tear)