I don't know if they are also in games where people have lower summoner levels than 30, but lately there is at least one bot in nearly every game I've been playing in ARAM. Sometimes there's one on both teams, sometimes there's more on one side. You know they are bots because they have no keystone and/or run into disadvantageous fights and will also not use certain abilities of their champ's kit. Like I saw a Heimerdinger that never used their turrets. They feed hard, much harder than most normal players even when it's a losing battle. It's frustrating that you have to hope that your player isn't a bot or if there's a bot on both sides, that your's doesn't feed as hard as theirs.
Everyone should report as many of these bots as they can and Riot you have to make sure to take these reports seriously, it's really hurting mine & other's enjoyment of playing this mode.