But critics have attacked the information in the report, much of which had been reported previously, as one-sided and misleading. Because signs of marijuana use remain in the body for weeks after the high has worn off, its presence in those involved in fatal crashes does not show whether it played a factor in the accident. Youth use was higher in states such as California, Colorado and Oregon before legalization, and have not increased in Colorado, at least, since then. And the $4.50 cost per $1 benefit estimate has questionable costs that do not distinguish from the costs of illegal marijuana use that are already occurring.