Now specialists are constantly improving their knowledge and undergo various recertification and training. The same doctors are constantly learning. So not only basic diplomas, but also certificates of additional education can be fake.
That's just 100% certificates can be fake. Anyone who owns a printer at home can print them. You don't even have to buy. That's just 100% certificates need to be checked.
It is not so simple to make a fake diplomas becouse they do in special tipography. That is why people simply buy a fake diplomas. And sometimes the quality of fake diplomas is rather good that they looks like a real one. It is necessary to cheach diplomas by number but it is hard to do this.