California § 311.8 - It shall be a defense in any prosecution for a violation of this chapter that the

§ 311.8. It shall be a defense in any prosecution for a violation of this chapter that the

(a) It shall be a defense in any prosecution for a violation of this chapter that the act charged was committed in aid of legitimate scientific or educational purposes. (b) It shall be a defense in any prosecution for a violation of this chapter by a person who knowingly distributed any obscene matter by the use of telephones or telephone facilities to any person under the age of 18 years that the defendant has taken either of the following measures to restrict access to the obscene matter by persons under 18 years of age: (1) Required the person receiving the obscene matter to use an authorized access or identification code, as provided by the information provider, before transmission of the obscene matter begins, where the defendant has previously issued the code by mailing it to the applicant therefor after taking reasonable measures to ascertain that the applicant was 18 years of age or older and has established a procedure to immediately cancel the code of any person after receiving notice, in writing or by telephone, that the code has been lost, stolen, or used by persons under the age of 18 years or that the code is no longer desired. (2) Required payment by credit card before transmission of the matter. (c) Any list of applicants or recipients compiled or maintained by an information-access service provider for purposes of compliance with subdivision (b) is confidential and shall not be sold or otherwise disseminated except upon order of the court.