By the year 2013, the Columbian armed forces will be using rats as a way to detect land mines.  It took them 5 years to develop this, but now that they have rats willl be used to detect dangerous substances such as ANFO, black powder, C4, detonation cords, Pentolite, TNT and ammonal.  They can do this in absolutely any sort of situation, as their agoraphobia (fear of open spaces) was removed to make this possible.

So far the rodents have been tested in areas as big as 32 square feet.  There are some advanteages to using rats to detect land mies.  For example, a rat will not detonate the explosive.  However a dog more than likely would.