[Atlas Sneezed]

Statistics for Dummies: note the word “involved” - in a multiple car accident it means all regardless of who caused the accident.

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Indeed. It also include accidents where a passenger is stoned, even if the driver was sober. It even includes stoned (or drunk) pedestrians who get mowed down by a sober driver while trying to cross a highway.

[DaveA37]

It’s named “Driving While Impaired” for a good reason. It doesn’t say driving due to use of marijuana or driving due to alcohol consumption or driving after sniffing drain-o.