So I read that the people of Yuma, AZ want to build a moat to keep out illegal immigrants...it works for castles right? Maybe have a drawbridge to mexico for people who do have to travel to go into Mexico that way? With the sandy terrain down there can you just imagine digging a moat? I thought my job was bad...but seriously...it's supposed to improve the environment and help save the dwindling Colorado River. I'll believe it when I see it.