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Unfortunately this is currently not possible with jotform. If you would like we can send a request on your behalf to our developers for this to be added as a feature.
On your form, on the 'Subscribe:' Section, You are using check boxes, which will allow users to select both...
Yes, I would like to subscribe to receive updates and information about the National EMS Academy. No, I would not like to subscribe.
I would suggest changing this to radio buttons.
In order to clarify your request, when you refer to a "person sending spam" , is that person sending spam submission to your form? If this is the case, you can use the "captcha" field to verify that it is a real person filling the form and not a automatic bot.
You can also set up the Unique submission option https://www.jotform.com/help/64-What-does-Unique-Submission-Mean
Hope it helps
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