How did the officer know you were driving on a suspended license? Where did this occur? A police officer can always stop you. Whether or not the stop was justified, i.e. whether there was probable cause is an entirely different issue. Did they cite or arrest you? If so, you should contact an attorney. Sounds like a case I would enjoy beating. Best of luck.
The real issue here is whether you need a license to drive an ATV.
My search produced the following:
Californians over the age of 17 don't need to have a license to operate an all-terrain vehicle (ATV).
However, if you're 17 years old or under operating an ATV on public land, you must make sure at least one of the following applies to your situation:
You possess a valid ATV safety certificate
You're currently enrolled in an approved safety course under the supervision of a certified ATV instructor
You're being supervised by someone who has a valid ATV safety certificate
Fight the ticket. Take care of your suspended license.
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