[ARCHIVE ANSWER]
A dog alert equals probable cause for a search without warrant. Give up your keys, or you will probably have a broken window. Too many canine handlers with no integrity out there will say their dog hit. For those guys do your homework, get witnesses who have similar stories with the same handler and burn him in court. The dog doesn't know how to lie, but some handlers sure do.They
can easily train the dog to dig on command too. If I point at the ground and say, "What is it?" my dog will start digging.