Demand for expert witness exchange?

Do you believe the plaintiff qualifies as an expert in any particular area of testimony that's relevant?

Sue LA county?

Consider the Federal Court in Los Angeles......Good luck.

Can a teacher swear at a student legally

It’s neither elegant nor breaking your right to free speech. Sorry, Junior.

Can my mother take my keys/car away from me?

Sure she can. She did. Who legally owns the car?

Can a prosecutor change charges 2 days before trial?

A motion for new trial suggests you were convicted at trial. Is that correct?

You could, but the case isn't worth more than a free haircut or two. Speak to the manager.

If I haven't stepped on city jurisdiction and city police pulled me over ? Can that happen?

Yes, that can happen. Police officers have "jurisdiction" statewide actually.

Technically, it could be considered a robbery which is quite serious. Seems like there's more to the story, but if someone snatched your phone,...

Would the state/people, usually "target" a person , if say they have ,NO criminal history/ "wrap sheet"?

Sounds like you need to hire a good lawyer and perhaps get some counseling too.

Can you go to jail for a violation I was put on probation w a 3 year joint suspension ?

If the judge is short on patience, you could definitely be going the 3 years "joint suspension."