In a 2017 report presented by the National Highway Traffic Safety Administration, the National Highway Traffic Safety Administration has reviewed the data collected to limit the risks associated with cannabis problems and the risk of death.
In un rapporto presentato al Congresso in 2017, la National Highway Traffic Safety Administration ha riconosciuto di disporre di dati di ricerca limitati sui conducenti con problemi di cannabis e sul livello a cui inizia il deterioramento.