Two-thirds of L.A. Unified's fleet lacks the safety devices, officials say. Since July 2005, school buses built to carry more than 16 passengers are required to have three-point seat belts.
The school bus in which 21 people were injured when it flipped on its side after being broadsided by a speeding BMW in Boyle Heights is among hundreds of buses transporting students in the Los Angeles Unified School District that are not equipped with seat belts.
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