I understand the implication. You are using an example to condemn an entire profession. That makes you little different from the "rotten apples".
RICO Lawsuit Against NHP About Drug Sniffing Dog Program
...The suit claims improperly trained dogs are taught to respond to handler cueing to alert for drugs, rather than actually sniffing for drugs. This type of training and the resulting dogs are referred to in the K-9 training industry as Trick Ponies. The dogs are trained to falsely alert to drugs by the cueing action of the handlers, resulting in improper and illegal searches of private citizens. This can result in illegal seizure of property and money, even when no drugs are discovered in the subsequent search...