BISMARCK, N.D. - Even the best child safety seat is useless if it's not properly installed.
The State Health Department says car seats are required to have tether straps, but half of them aren't used correctly.
The straps anchor the seat, preventing it from moving around in a crash, which can save a life.
“It reduces the movement of a child in the car seat 6-8 inches or more in a crash, which is significant when everything else is moving around in the car,” said Child Passenger Safety Program Director Dawn Mayer.
A study last year showed that 20 percent of children who died in car crashes were not properly restrained.