Gig 601XL Builder writes:

The lack of a license is prima fascia evidence that he does not have the
skills.

No. The possession of a license is prima facie evidence that he has
the skills, but the converse is not true. Many people may have the
skills but choose not to get the license. There are far fewer people
who do not have the skills and yet manage to get the license.

It would then shift the burden of proof to him to prove that he did.

Having an accident can be pretty good evidence that he lacked skill.
Not having an accident can be pretty good evidence that he had skill.

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