The existence of alternatives to handwriting analysis don’t impact whether handwriting analysis will be legitimate once a licensing board is established.

This suggests handwriting analysis might be difficult to do reliably for someone who’s untrained, but that doesn’t undermine Gregory’s position. To him, once a licensing board is established, professional standards will be set, which will lead to trained practitioners.

This doesn’t undermine the idea that the licensing board can raise professional standards and help handwriting analysis become legitimate. As long as the people who are licensed are qualified, it doesn’t matter that some qualified people are unlucky and don’t get a license.

If true, (D) means that there wouldn’t be any analysts that could be licensed by the board. If the only analysts who would testify that handwriting analysis is reliable are irresponsible, the licensing board won’t help handwriting analysis become legitimate.

Even if there’s a small number of analysts who can be licensed, they could be highly trained and responsible, and therefore still help make handwriting analysis legitimate in the courtroom.