From: VisaPlace.com on
Canadian airports will now include specially trained officers who
“spot “suspicious individuals based on their behaviour and how they
look or dress. The new behavioural security program is called SPOT,
which stands for Screening Passengers by Observation Technique.

More info:
http://www.visaplace.com/blog-immigration-law/canada-visa-news/you-are-now-being-spotted-at-canadian-airports/