You don't need evidence of his drug use or infidelity to divorce him, since CA, like most states, is a "no fault" divorce state and the only grounds you can indicate on your petition for dissolution is "irreconcilable differences."
But keep the evidence and certainly you can provide it to your family lawyer. If you've got kids and custody is an issue, then his drug use and infidelty would be important.
Avvo doesn't pay us for these responses, and I'm not your lawyer just because I answer this question or respond to any follow-up comments. If you want to hire me, please contact me. Otherwise, please don't expect a further response. We need an actual written agreement to form an attorney-client relationship. I'm only licensed in CA and you shouldn't rely on this answer, since each state has different laws, each situation is fact specific, and it's impossible to evaluate a legal problem without a comprehensive consultation and review of all the facts and documents at issue.
It will matter how you collect and preserve the information.
You should talk to an attorney sooner rather than later, because if the information will be useful or necessary as evidence, the specific rules of your state may impose limits or requirements for how it is authenticated.
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