http://en.wikipedia.org/wiki/Clever_Hans#The_Clever_Hans_eff...
"The Clever Hans Effect has also been observed in drug sniffing dogs. A study at University of California Davis revealed that cues can be telegraphed by the handler to the dogs, resulting in false positives."
http://en.wikipedia.org/wiki/Clever_Hans#The_Clever_Hans_eff...
"The Clever Hans Effect has also been observed in drug sniffing dogs. A study at University of California Davis revealed that cues can be telegraphed by the handler to the dogs, resulting in false positives."