Can I be charged with a crime under California’s “good samaritan” law if I leave a scene of a crime without helping the victim?

No – that is not the purpose of California’s “good samaritan” law, which is not a penal law.  Rather, California Health and Safety Code section 1799.102 – commonly referred to as the “good samaritan” law – was enacted to protect laypersons who choose to render emergency aid: “No person who in good faith, and not for compensation, renders emergency care at the scene of an emergency shall be liable for any civil damages resulting from any act or omission.  The scene of an emergency shall not include emergency departments and other places where medical care is usually offered.”  However, in December 2008, the California Supreme Court limited the statutory protections by holding that good samaritans are only protected from civil lawsuits if they are providing medical assistance at the time their actions inadvertently or negligently cause the victim further injury. 

There is no criminal liability for failing to report a crime or provide assistance to a crime victim. You should consult with a civil attorney, not a criminal defense attorney, if the police track you down and use inappropriate methods (i.e., threats of arrest or violence, harassment, intimidation, etc.) to try to force you to give a statement about the mugging, view a line-up, etc.  The attorney can help you identify appropriate forums for formal written complaints against the involved officers and determine if their actions have violated state and/or federal civil rights statutes.