Is it a reportable offense to play if high?

One of my recent games had a support who was duoing with the mid and the mid said that the reason he was feeding was because he was high. Could I report them for this? And if so, under what? I assume intentionally feeding or unsportsmanlike conduct.

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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