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If you leave and don't appear in court, then a warrant will be issued for your arrest. This will mean that the next time you try to enter the USA, you will be refused. And, if by some chance you are not refused, then you may be arrested by law enforcement and held for trial.
However, California authorities will not try to have you extradited from Mexico, so if you don't plan to return to the USA, then you can leave.
The only other alternative is to hire a lawyer and try to get the charges dismissed before your court appearance date.
Hope this helps.
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It's possible, but the fact that you would return from Mexico would show that you are not really a flight risk, because your return was entirely voluntary. The court would probably release you on your own responsibility, or it may set a small bail amount. But, you wouldn't be jailed -- that would be incredibly unlikely, given the charge against you.
Although, I can't promise you anything. A lawyer who works that courthouse would have better info on the judges' predisposition for various actions.
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