Laws in forty-two states, the District of Columbia, Guam and the Virgin Islands prohibit texting behind the wheel by all drivers. The eight states without such laws have all seen efforts in recent years to follow suit. Four of the states with texting bans have secondary enforcement statutes requiring an officer to catch the driver in another traffic offense. Two of those states have seen legislation introduced this year to move up to primary enforcement, where an officer can ticket a driver solely for texting while driving. But even as states are trying to crack down on texting, some in law enforcement question the degree to which such laws can be enforced and the degree to which they can be successful.