Getting all my documents together for a retirement visa from home country of USA.

Right now trying to get my criminal background check done. Called my local law enforcement agency about getting this done. They seem to be clueless, they mentioned about finger print card that does that meet the requirement for Visa? Second of all does have be an official hard copy letter from an official office stating that im cleared or can they email the background check and then i print the the results off and use that as my background check document?

Thank you in advance for any help, I live in the state of Ohio