Its my understanding that in some jurisdictions if you are CHARGED with a felony you'll get a letter in the mail requesting you send in your CCW.
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If you get convicted of a felony, they should tattoo Felon across your forehead.
18-12-111. Unlawful purchase of firearms.
(1) Any person who knowingly purchases or otherwise obtains a firearm on behalf of or for transfer to a person who the transferor knows or reasonably should know is ineligible to possess a firearm pursuant to federal or state law commits a class 4 felony.
I Usually just ask, "Is there any reason you cannot legally own or posses a firearm?" coupled with seeing a CO ID with their picture.
all that's really required plus a little.