Re: It's all in the 'title'
I was taught that a "professional" is one in whom gross misconduct or dishonesty could of itself bar them from effective participation in their profession.
That is, their integrity is gone, not merely that a registration board has de-listed them.
Who would hire a software engineer found guilty of inserting back doors without their employers knowledge? Or who would lie on a passport form? If you can't trust their word, you can't trust their work.
Hence, a professional being trusted to sign a passport form because of what they have to lose if they lie.