I had this question in my mind for a while and I still haven't found a reason for this. Maybe you could help me explaining me how this works.

First of all, I'm not a terrorist or a drug courier if you could think so.

Starting from June 2012 I began flying from Leonardo da Vinci–Fiumicino Airport (FCO) to Falcone–Borsellino Airport (PMO) for personal reasons and everytime I did a round trip, so I leaved FCO and a few days later I returned to Rome. I didn't fly only during the weekend, in fact I think that in those two years I flew during every day of the week and every time of the day since I was always looking for the best flight fare and for this reason I also booked on different airlines, from the low-cost ones (Ryanair, easyJet, Vueling) to the standard ones (Alitalia and Meridiana).

When I arrived to FCO and/or PMO I always saw the policemen and their drug dogs but not even once I was blocked and/or asked for a simple and fast check of the baggage or myself, I always walked and exited the airport without problems.

So my question is: why?

Didn't the policemen ever suspect me for all those round trips? Or won't they check passengers like, for example, they do on the streets when they stops random vehicles?

This seems a bit all strange to me.