The answer is almost certainly no--because the California lawyer-client privilege protects almost everything you say in confidence to your attorney from disclosure.
Under California Evidence Code 954, this privilege protects all confidential communications between a client and his/her attorney. The privilege applies to:
- The client (who does not need to disclose any of these communications and may not be forced by subpoena to do so);
- The lawyer (who may not disclose any of these communications without the client's permission); and
- Any third parties who learn of these communications through eavesdropping (who also may not disclose them without the client's permission).
The only exceptions to the attorney-client privilege in California are situations where the client seeks the lawyer's help in committing or planning a crime, and situations where the lawyer feels it is necessary to disclose the communications to prevent someone from getting killed or seriously hurt.
So, by all means, do not hold back important information in your conversations with your criminal defense attorney. These conversations are private and privileged. And the more information your attorney has, the more s/he can do to help you.