What types of jobs/ career paths can a person become certified in a specialization, or licensed to practice, without any formal training specifically required?

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I'm thinking of how a lawyer can technically practice law if they've passed the bar without going to law school.

Are there other industries like this? Where if you study hard, it's possible to pass a licensing test or certification to become a registered professional in the field?

I know that there are plenty of jobs where independent study can earn you money without a license or certificate. I'm mainly looking for industries where a license/ certification is required to practice legally, but where formal training is not a prerequisite to entry.

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