Not against the law. The Channel islands are not on the southern border. That doesn't mean that smuggling has not occurred there...

The mind boggles at the inhumanity of someone who would deliberately destroy a water cache in the desert. I have spent some time in the Cabeza Prieta, along the aptly named Camino del Diablo, and in the wrong season,it is very rough country, indeed.
Geezer in Chief