I've never seen bots in Smmoner's Rift, probably because it's more difficult to program or something.
So I've noticed bots in ARAM lately. Like usually I see the bots in twisted treeline, 75 percent of the time. I've been farming ARAM games to get use to different characters, when I notice a weird pattern in names, which I detect instantly from having so many bots in my twisted treeline games.
Here's a picture... https://i.imgur.com/GfjSO1A.png
**H is for Human, Underline is assumed bots.**