The process of clearing land mines is slow, pain staking, and of course dangerous. In fact, using a metal detector, it takes one person roughly a week to clear a 100 square metre area of mines.
www.telegraph.co.uk
Not only that but most modern land mines are made with plastic making them almost impossible to locate with metal detectors.
BUt I guess this is another example of the left throwing up their hands.
Fence - wont work, forget it
Mines - wont work, forget it
guns - wont work, forget it
walls - wont work, forget it
Army - can't do it, forget it
anything else - too expensive, forget it
Cheers,
Walt