"Friend discharged from ED with cannula still in..."

I've just had to inform a friend on the phone how to remove a cannula from her boyfriends' arm which was left in after he attended A+E at Queen's. As a healthcare professional who has worked in A&E myself, surely one of the things on a discharge checklist is to ensure all invasive lines have been removed. Not only is it a direct access point into his veins, it is a potential hazard for infection and trauma to the surrounding tissues. Please can it be highlighted to the A&E staff, both nursing and medical, to be more vigilant when preparing a patient for discharge. Many thanks.