(Modded) How to make sure nobody is using imperium or cheats?

Hello, I have a friend who I play lethal with but he keeps cheating using like some spawning mod and not sure if it’s imperium, but we still want to play qith him and he’s autistic so he probably doesn’t understand why we don’t want him to cheat.

Is there any way I can see what mods he uses or make sure all players have the same mods as me when we play? I tried hostfix and people on reddit told me it’ll tell me what mods other players have installed, but it doesn’t tell me anywhere actually