airport
animal
auto
automobile
bomb
border
breed
canine
car
check
contraband
control
criminal
customs
detect
detection
dog
drugs
duty
german shepherd
guard
illegal
inspection
mammal
military
narcotics
officer
outdoors
patrol
pedigreed
pet
police
protect
purebred
safety
search
security
service
sniff
sniffer
trained
transport
transportation
trunk
unit
vehicle