There was a great Ted Talk on using rats for this a couple of years ago [0]. An interesting discovery is that they're also really good for finding TB. [0] http

There was a great Ted Talk on using rats for this a couple of years ago [0]. An interesting discovery is that they're also really good for finding TB. [0] http://www.ted.com/talks/bart_weetjens_how_i_taught_rats_to_sniff_out_land_mines.html http://www.ted.com/talks/bart_weetjens_how_i_taught_rats_to_...