Once again, we have the San Diego Unified School District police sending a negative message ("Drug-sniffing dog has increased presence on campuses," Oct. 8) to the students of our educational institutions: A police officer walking the halls of education with a German shepherd to detect illegal drugs. What could be more negative? This sort of nonsense needs to stop. School Police Chief Rueben Littlejohn is sending a message of fear and intimidation and is not in touch with an educational atmosphere.c Gary Trout San Diego [end]