Legalizing marijuana may be a positive step toward concentrating law enforcement and detention efforts where they are needed most, but even proponents of legalizing marijuana should be concerned about the latest effort. The initiative would legalize pot for adults but could land them in prison for getting in an accident, even days later when they are not impaired. The initiative rightly prohibits driving under the influence of marijuana but fails to address Nevada's prohibited substance law, which makes it illegal to have traces of pot in your blood. In essence, it would amount to a penalty for engaging in a legal activity.