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My child's preschool uses backless booster seats with the hard plastic chest cushion, which is secured with the car's seatbelt. (Shoulder belt goes behind the child's back.). I heard these were unsafe, but can't now find the literature to share with the preschool's owner. Can you point me in the right direction? I don't even know what these seats are called. My kids are 30 lb. two year olds and I'd like to make the argument for my school to upgrade to safer seats. Thanks.