Here's one link to the video...
Scroll down the page for the section titled;
CHP Takes Part In Door-To-Door Searches
http://www.ktvu.com/news/4936363/detail.html#
I've seen others versions of the clip though, and I too thought I remembered it being on FOX. I'll see if I can't find some of the other links. In this one you can hear her swearing at them after they tackled her. They say she had a knife as well as the gun, but I didn't see a knife. Also she wasn't holding her gun in a threatening manner. She did state - "you'll have to shoot me".
I've seen others versions of the clip though, and I too thought I remembered it being on FOX. I'll see if I can't find some of the other links. In this one you can hear her swearing at them after they tackled her. They say she had a knife as well as the gun, but I didn't see a knife. Also she wasn't holding her gun in a threatening manner. She did state - "you'll have to shoot me".