Gov. Code, § 3307

(a) No public safety officer shall be compelled to submit to a lie detector test against his or her will. No disciplinary action or other recrimination shall be taken against a public safety officer refusing to submit to a lie detector test, nor shall any comment be entered anywhere in the investigator’s notes or anywhere else that the public safety officer refused to take, or did not take, a lie detector test, nor shall any testimony or evidence be admissible at a subsequent hearing, trial, or proceeding, judicial or administrative, to the effect that the public safety officer refused to take, or was subjected to, a lie detector test.

(b) For the purpose of this section, “lie detector” means a polygraph, deceptograph, voice stress analyzer, psychological stress evaluator, or any other similar device, whether mechanical or electrical, that is used, or the results of which are used, for the purpose of rendering a diagnostic opinion regarding the honesty or dishonesty of an individual.