The picture comes from CNET
A case that happened in 2015 allowed more people to understand this ability of police dogs. A Labrador, named "Bear", has successfully found a man's top plate and helped police find that it contains child pornography and eventually convicted the man.
The K-9 police officer of the Connecticut state police said that only 1 of the 50 dogs tested had a strong enough nose to identify the faint scent in the electronic device. More clearly, let the dogs look for a compound three - phenyl phosphine oxide in electronic equipment, which is usually stored in electronic smoke, bombs, drugs, electronic equipment and so on.