A: All the records including police reports, fingerprints, and booking photos of that arrest are destroyed. Thereafter, you can legally and confidently say "no" if a potential employer asks whether you have been arrested.
A: Yes. An individual can have a record of arrest sealed and destroyed provided they were arrested but not convicted of a criminal offense. A petition to seal and destroy pursuant to Penal Code section 851.8 can be brought even if criminal charges were filed by the district attorney.
A: Unlike traffic conviction, records of an arrest or criminal conviction will exist forever. A record of an arrest of criminal conviction will not automatically be erased from my record after a certain period of time. If you desire to erase or limit the disclosure of a record of an arrest or conviction you may seek an expungement, to have your records sealed and destroyed or a pardon.