Parents don't always follow booster seat rules

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PHOENIX (CBS5/CBS) -

Most parents know to buckle their children into a booster seat in their own car but they don't always require them to use one in someone else's car.

That's according to a new study in this week's Journal Pediatrics.

The research found that more than 30 percent of parents don't enforce the same rules when their kids ride in a different car.

Most states require children to use a booster seat up to the age of eight.

National recommendations encourage booster seats be used until a child grows to 57 inches, which is the average height of an 11-year-old, according to the study.

Copyright 2012 KPHO. All rights reserved. CBS News contributed to this report.