They say you never really know what goes on behind closed doors. And that couldn't be more true than when it comes to the cannabis factories found across Wales.
The everyday tranquillity of quiet residential areas across Wales has been interrupted on several occasions this year, as police have raided unremarkable, normal looking houses that you wouldn't normally give a second glance to when walking down the street.
Inside has often been anything but normal - as police have discovered criminal enterprises running large cannabis factories within.
