Can't. They have customs inspectors at the state border crossings, but since that would be unconstitutional, they call them "agricultural inspection stations" instead. They would nail you with the tax there.
They are not customs inspectors, they are exactly what they say they are, agricultural inspectors. I have been back and forth across the border numerous times, sometimes with firearms in my vehicle. Because I have California plates, I haven't even been stopped every time. When I do stop, they ask if I have any fruit, vegetables or plants, and where I'm coming from. If I have some fruit, I tell them. If it's citrus, they want to look at it. That's it. They've never asked to look at anything else, or asked me to pop the trunk, or anything else. I here this often on these thread, but it's simply not true that these guys will search your car and take your guns. Not that I'm trying to defend what California is doing in other arenas, I'm not, but this is one thing that just isn't true. And if the .10 fee (yeah, they're calling it a fee to get around the 2/3 vote for a tax) passes, I'll be going to Reno several times a year to um, gamble. And the car will be coming back with a load on. And I won't be worried about the agricultural inspectors.