Use one method in multiple controllers ?

[eluser]Monarobase[/eluser]
A simple require_once on a file that contains just the method would do the job but would somewhat break the whole principle of codeigniter and I'm sure it's not the best way.

I have looked into the different ways I could use to call this method but normally helpers and libraries and don't call views...

I'm seriously thinking about duplicating my login method in all controllers unless someone can suggest a better way around this.