border controls for Andorra and other micro states?

I've seen several mentions here of the lack of border control in Andorra, and indeed, I saw none when I entered nor when I left. But a web search finds a lot of pages stating they do maintain border control and none (that I saw) saying the opposite.

Several source make Monaco, San Marino and the Vatican City "de facto" members due to reduced or no border control, but when I tried to add Andorra in Wikipedia, it was reverted on the grounds it needed a citation. (though the citation for the other three is a 404.)

Anything official for Andorra or the other three?

Pictures about "border controls for Andorra and other micro states?"

border controls for Andorra and other micro states? - Prohibition parking road sign with Subject To Ticket inscription placed on street of city near concrete barrier in evening time

border controls for Andorra and other micro states? - Unrecognizable male in casual clothes and wristwatch leaning on metal concert crowd control barrier while standing on street in city

border controls for Andorra and other micro states? - Black and Gray Bmw Car Steering Wheel

Can microstates join EU?

The Vatican City, which is not taken into account by the decision-makers, should not be considered a potential candidate for EU membership either, even in the long term. Hence, only the other three microstates: Andorra, Monaco, and San Marino, could be taken into consideration.

Why are microstates not in the EU?

Currently, all of the European microstates have some form of relations with the European Union (EU). Andorra, Liechtenstein, Monaco, San Marino, and the Vatican City remain outside the Union, because the EU has not been designed with microstates in mind.

Is there border control between Schengen countries?

The Schengen Borders Code (SBC) provides Member States with the capability of temporarily reintroducing border control at the internal borders in the event of a serious threat to public policy or internal security.

Is Andorra a micro country?

The European microstates or European ministates are a set of very small sovereign states in Europe. The term is typically used to refer to the six smallest states in Europe by area: Andorra, Liechtenstein, Malta, Monaco, San Marino, and Vatican City.

SPAIN -ANDORRA BORDER CROSSING/ANDORRA-SPAIN BORDER CROSSING

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Images: Javon Swaby, Erik Mclean, Dayvison de Oliveira Silva, Hasan Gulec