police searched my home looking for illegal pornography what are my rights under CA search and seizure law

You need to seek out an experienced criminal defense attorney in your area as soon as possible.

All contact with the USPS, the District Attorney and the Sheriff's department must be made through counsel. Anything you have said or communicated can be used against you in court. DO NOT CONTACT THEM AGAIN WITHOUT COUNSEL.

If anything illegal is found on your computer and if it was received over the internet - it could subject you to Federal prosecution in addition to any California charges that might be pending upon completion of the investigation.

Tell your attorney everything you know about the investigation and he/she should be able to find out what is going on. Hopefully it is all a mistake. However, if it is not and California and/or the Federal Government decide to return indictments against you - you will be far ahead of the game and in a better position to defend your case with a criminal defense attorney retained and familiar with the initial facts surrounding the investigation.

Obviously you should find local counsel - specifically I would want to speak to someone who does federal criminal defense. There are huge mandatory minimum sentences that Congress has created for certain child pornography and child enticement offenses. A child enticement charge, for example, carries a 10 year mandatory minimum prison sentence. I echo the advice of the other response - do not contact the authorities without counsel.

You must speak to an experienced criminal defense attorney who practices in the Central District of California and is familiar with the federal and county law enforcement agencies and prosecutors who could potentially be involved. Receipt of Child Pornography is a federal and/or state offense and could result in a mandatory prison sentence.

Your contacts made without representation to the various authorities you have mentioned may be subjecting you to risk of prosecution. Only an experienced criminal defense attorney should make contact with these entities on your behalf.

If the police didn't believe that they had something, this would likely be over by now. They are probably simply continuing their investigation in order to bolster their case. When you speak to the police, youare only providing them with an additional opportunity to gather further evidence against you. Each of the prior attorneys posting on your question has advised that you get an attorney immediately and stop talking. I agree whole heartedly.
David C. Beyersdorf
Lee & Beyersdorf, Llp
2110 North Winery Avenue, Suite #101
Fresno, CA 93703
(559) 252-7000