Hawaii lawmakers are asking how much marijuana a driver can safely consume before getting behind the wheel of a car. It’s an issue they want to tackle now that Hawaii is setting up medical marijuana dispensaries. So Rep. Cindy Evans and 15 other lawmakers introduced a resolution asking the state Department of Health to study whether a person can safely drive while under the influence. Marijuana is the illicit drug most frequently found in the blood of drivers who have been involved in accidents, including fatal ones, but the role marijuana plays in those accidents is often unclear because it...