Excellent idea put forward by doctor to stop "free riders".
https://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&ved=0CDkQFjAB&url=http%3A%2F%2Fwww.independent.co.uk%2Flife-style%2Fhealth-and-families%2Fhealth-news%2Fgive-organ-donors-transplant-priority-doctor-calls-for-new-way-of-dealing-with-the-problem-of-free-riders-8777115.html&ei=PxUhUszeGYvT7AaWqIDgAw&usg=AFQjCNF04ii-O6AP1yCZnm-1nU5EopQfTQ&sig2=W4mwn-I7mQvdzl8Idbi1WQ&bvm=bv.51495398,d.ZGU
https://www.google.co.uk/url?sa=t&rct=j&q=&esrc=s&source=web&cd=2&cad=rja&ved=0CDkQFjAB&url=http%3A%2F%2Fwww.independent.co.uk%2Flife-style%2Fhealth-and-families%2Fhealth-news%2Fgive-organ-donors-transplant-priority-doctor-calls-for-new-way-of-dealing-with-the-problem-of-free-riders-8777115.html&ei=PxUhUszeGYvT7AaWqIDgAw&usg=AFQjCNF04ii-O6AP1yCZnm-1nU5EopQfTQ&sig2=W4mwn-I7mQvdzl8Idbi1WQ&bvm=bv.51495398,d.ZGU