It is possible for you to be charged with a crime without knowing about it. While there are many situations where you could be arrested on the spot for allegedly committing a crime, there are other times where the police investigate crimes after the fact. A prosecutor may authorize criminal charges, and a warrant for your arrest could then be issued by a court. The police do not have to notify you that an arrest warrant has been issued or that you have been charged with a crime before showing up to arrest you.
If you are concerned that you may be charged with a crime, an experienced criminal attorney Orange County, CA can determine whether there is an ongoing investigation. Your lawyer can work with the police and prosecutor, advocating on your behalf in an attempt to avoid an arrest.