You should know that the guard manning the security post has a button to make it ring, and they will usually do whenever bored, suspicious or want some contact.
In fact a similar thing happens with k9 dogs: they don’t know what drugs are, so they tend to follow body gesture cues from their handler, as the handler looks at the vehicle owner cues.
I once got a drug dog very excited about me by getting corned beef hash spilled on my leg half an hour before the flight from Samoa.
Seven hours later, drug dog rocks up in Sydney and sniffs my leg and the poor bored cops look at me like I’m El Chapo and go through all my stuff, only to look disgusted when I mention the stain is meat juice.
I hope the poor dog got some beef treats sometime after at least.



