How can I validate submitters are real people?

I want to post a form which ensures there are no repeat submissions for the same person, and that each one has a real person submitting the form.

How can this be done?

Thank you!

Thank you for reaching support,

You may add a ReCaptcha on the form, this will force submitters to verify the ReCaptcha before proceeding:

Here is the related guide: https://www.jotform.com/help/205-how-to-add-a-captcha-field

Best.