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Robot cars can be crashed with tinfoil and painted cardboard
(www.theregister.com)
This is a most excellent place for technology news and articles.
More exciting would be an exploit that renders an unmoving car useless. But exploits like this absolutely will be used in cases were tire-slashing might be used, such as harassing genocidal vips or disrupting police services, especially if it's difficult to trace the drone to its controller.