Does everyone still require Snell rated helmets

[GooseRacer]

So I know helmets used to have to be Snell rated to use, I found a very very nice agv that I can get easy. But it's only dot rated.. new Valentino Rossi helmet.. love the design on the back..my thought was dot rates them for 140 mph bike it's gotta be safe for a kart.

 

[Wynn Racing]

All of the sanctioned races we have been to that have pre tech require snell rating, tri state, mid atlantic, vdka. Dot alone will not pass. Some have both ratings, but not all.