If you go to the police station where you live, you can get one from the records section there. It will not contain records from pending but not charged events. You can also try the state police. There it would likely be a state wide record. At least thats how it is in Virginia where I practice. If you are looking for federal charges, that office is different. I've done it before. It is a request under the Freedom of Information Act (FOIA) to the FBI. I cannot tell you the address though. Its been a while. Good luck with this.
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Don't waste your time by following the advice above. Maybe police departments in Virginia will give you your criminal record, but it isn't going to happen in California. Filing a Freedom of Information request is time consuming and complicated.
You can get your criminal history ("rap sheet") from the California Department of Justice for $25. You will also need to get fingerprinted at your local law enforcement agency.
The complete instructions are at: http://www.ag.ca.gov/fingerprints/security.php