They'll sniff out the contraband

found on I Can Has Cheezburger

Remember to show them plenty of respect and don't act aggressively.

We need to secure our border too

found on Canada Memes

Detection isn't always enough

from here (image source)

Sometimes detecting the intrusion is the easy part. Sometimes it doesn't help correct the situation at all. That's what people in an Alaskan hospital discovered when a moose wandered inside.

Kinda makes you wonder about intrusion detection systems, doesn't it.