Driving in Portugal

Dear Editor,
I am intrigued – I have driven, virtually daily, various types of motor vehicles all over the world, in Africa, India, Egypt, USA and Australia, and most of 62-odd years at the wheel.
In hundreds of thousands of miles in all of that time, I can only remember being stopped one time, solely to be asked for documents and not for any infringement of the law.
That was in Morocco a couple of years ago. A handful of coins rectified that.
So why is it that already this year in Portugal, between my wife and I, we have already been pulled over three times for no other reason than documents.
Barely a day can pass without you seeing the police at the side of the road stopping vehicles.
Are they just being super efficient or is it just a way of raising funds?