A California prosecutor wants to charge parents.

Their children were in e-bike crashes.

Orange County District Attorney Todd Spitzer has many open investigations.

His office charged four parents.

One mother has a 14-year-old child.

That child is accused of killing a pedestrian.

Other places do different things.

New York City warned online stores about illegal e-bikes.

A 17-year-old died.

New Jersey now says riders must be 15.

They must have a license.

California has no minimum age for lower-powered bikes.

Some parents and advocates say these steps are not good.

Monica Stafford's daughter broke her skull.

She wants one national set of rules.

She said officials are in a "Wild West of laws."

Cycling groups say many dangerous vehicles are e-motorcycles.

Stores sell them as e-bikes.

Researchers say e-bike injuries are worse than bike injuries.

Dr. John Austin said patients are often younger.

They often do not wear helmets.

Parent Sharon Franke says safety starts at home.

She said research and training help.

She said balancing fun and safety is "overwhelming right now."