Public Health and Safety New Calif. Law Requires Smoke Alarms To Have Tamper-Proof Sealed 10-Year Battery KVCR | By Katie Orr Published June 29, 2015 at 1:47 PM PDT Facebook Twitter LinkedIn Email Listen • 1:02 onsafety.cpsc.gov Starting July 1, you'll be limited in the types of smoke alarms you can buy in California. Capital Public Radio's Katie Orr reports.