How do you get inters banned?

Just curious, in lower elo, lets say plat or below, if someones is inting but not just running it down mid, how do you prove they are inting? The first thing that comes to you're head when u hear inting, is mobile boots and running it down, but obviously people are more subtle as in running to the nearest enemy and making a half assed effort at attacking just intentionally die? Is there a way to make sure they get what they deserve for it or is it just ignored by riot ( personally i dont think they can do anything to help this but this post is just more a general question to see if anyone could offer some insight and not another " oh riot is so lazy and trash" .)
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