Years (many...) ago I bought a book called "The Listeners Law Book" that listed the then in effect scanner laws by state. The common theme, and law in CA where I live was "you can listen but you cannot disclose or interfere in any way. That said, I have on two occasions called PD when I saw what they were looking for after hearing it on the scanner. Both times they quickly asked "how I knew that", and wanted me to ID myself. Cooperating fully seemed to help credibility. I have posted on the "funny / odd things heard" forum and enjoy it, but I believe discretion is in the best interest of our hobby.