I found the camera afterwards but don't have proofs with me anymore.
He "seemed like" he deleted it in front of me right away. But I don't trust him because I just found out there were more than one from who knows how long ago.
What kind of benefit and compensation will I get if I do decide to sue him?
Will I even win the case?
He can be held criminally and civilly liable.
CA has a wiretap law that covers video tapes and it requires the consent of all the parties, and you clearly didn't consent to this. CA Penal Code § 632. The statute applies to "confidential communications" -- i.e., conversations in which the participants have an expectation of privacy. A CA court has ruled that this statute applies to the use of hidden video cameras to record conversations as well. CA v. Gibbons, 215 Cal. App. 3d 1204 (1989). In addition to criminal prosecution, violating the CA wiretapping law also exposes your ex to a civil lawsuit for damage. CA Penal Code § 637.2.
What are your damages? Has he posted this video online? If he's keeping it for private use, you have very minimal damages. So you may not get much benefit and compensation.
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