Just had an Aram where a 
spent all game grabbing allies, snowballing into the enemy team, dumping them and leaving them to die while flashing out. Forced inting really..
I took screenshots, but it's the sort of thing that's difficult to show without motion.
Of course. Submit a ticket to Riot Support. Explain to them what happened and show them the file. They'll review it.
It's better to just tell them what game it was in - they have all the data for the game, and I think it's likely they have something even more powerful than client replay they can use to look at the game.
Oh fuck yea, Riot will PUT THE SMACKDOWN ON HIM BROTHER, JUST SUBMIT YOUR TICKET BROTHER, TO RIOT BROTHER SUPPORT, AND WITHIN A DAY OR 2 A RIOT SUPPORT BROTHER WILL LET YOU KNOW THAT BROTHER IS OUT OF HERE!.
c:
riot has all game replays for every game played. you dont have to download and send it to them. (ofc talking for a recent game). unlike what Chermorg said, they will never watch it or punish that guy. they just dont watch such replays for random cases people report in player support. when they rarely watch some replays, its very rare and it is to see patterns and enhance the intentional feeding system into seeing these cases. a vmc employee will reply to your ticket saying thanks for the report, we will do an investigation but we cant disclosure any punishments that guy may or may not receive due to confidentiality reasons. what he will ACTUALLY do, is send to that guy you reported, in that specific game, an "intentionally feeding" report JUST AS you did after your game ended. nothing more. and ofc nothing more will happen than what would have happened if you didnt send the ticket. if he is going to get banned, he would have been banned in the next 15 minutes after you reported him, or he is going to be banned because of another game and/or for another reason.
to answer the tilte-question of your thread, yes riot is able to. but they basically dont, ticket'ed or not. noone is going to get punished for trolling/inting just from a riot support ticket (if he is not punished already from the intentional feeding system 15 minutes after the game ended), unless you see a rioter making a post or thread about it in forums.
