Police Sergeant O'Malley reports that all police precincts in the city of Garrison have drug-seeking dogs, and that some police precincts in the same city have search-and-rescue dogs. Sergeant O'Malley professes to know all about dogs. Search-and-rescue dogs, he says, are better at tracking, but are disobedient, whereas drug-seeking dogs are obedient. All the precincts, Sergeant O'Malley maintains, have discontinued the use of attack dogs, because they are too dangerous.From the information given, it CANNOT be validly concluded that, according to Sergeant O'Malley,