A Brief History of the Verb Vet

When we vet a statement for accuracy or vet a candidate for a position, what are we doing, literally? Does the verb have something to do with veteran "a person with long experience," perhaps indicating that the thing or person vetted is proved to be tried and true?

Interestingly, the word is not related to veteran at all, but rather to veterinarian "an animal doctor." That noun was shortened to vet by the mid-19th century and, within decades, gave rise to a verb vet meaning "to subject (an animal) to medical examination." The verb was soon applied to human beings as well, broadening in sense to "to perform a medical checkup on." By the early 20th century, this word took on the figurative meaning that is now most familiar: "to subject a person or thing to scrutiny; to examine for flaws."