adult
airport
animal
baggage
border
breed
canine
contraband
criminal
customs
departure
detection
dog
drugs
duty
forbidden
german shepherd
guard
handler
illegal
inspection
luggage
male
mammal
man
military
narcotics
officer
outdoors
patrol
pedigreed
pet
police
protect
purebred
safety
security
service
sniffer
terminal
trained
transportation
travel
unit
worker