Searching cell phones with search warrants and finding other evidence

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Hey guys, welcome to another roadside chat. My name is Anthony Bandiero, Senior Legal instructor and Attorney at Blue to Gold Law Enforcement Training. This question comes from an officer in California. And he asks whether, if you're executing a search warrant on a cell phone, and let's say the search warrant is for firearm violations, right, you can picture maybe a gang member, a felon, and we believe that we have evidence of fire, you know, that firearm possession on the cell phone. And so the officer is looking through the phone, text messages, Facebook, etc, etc, for firearm violations, but comes across evidence for narcotic sales. Does the officer have to stop searching the phone? And for you know, in order to does it also have to stop  ...