Remote-controlled rats to sniff out explosives / New Scientist, 25 April 2005

http://www.newscientist.com/article.ns?id=dn7302
Will Knight
"An elite squad of real but remote-controlled rats could soon be scouring enemy bases and sniffing out explosives for the US military.
The rodents are directed using a series of brain implants, which can be operated wirelessly from a distance of several hundred metres. Now, for the first time, the researchers behind the project have demonstrated the ability to control the rodents' movements before activating their 'sniffer dog' instincts."