Fortunately, actual cases of juice-jacking are rare or nonexistent in America. But they can happen through USB connections. How can you avoid malware? If a kiosk has actual power outlets to charge your phone with your adapter, there's no fear of hacking.
If you're desperate for juice, use a USB connection safely with the right cable. Pack a charge-only cable for your trip. They're cheap, compact and don't allow for data transfer. Come to think of it, that's more of a 'do'.
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