Rather you're being facetious or not, I don't exactly know. If You are being serious, I'm not sure why you would need to subject your significant other to an FBI background check? Not to mention, an FBI background check will not specify any local ordinances that could pertain to theft, counterfeiting, fraud, etc. FBI is strictly criminal, but it does not list other related crimes subject to local ordinance violations for shop lifting for example.
Most states offer court access systems for either a free or paid record check that indicates all criminal and ordinance related involvements.
In my state, we have a court access system that is free to the public, and all you need to do is enter their full name/DOB and it will indicate any traffic, civil, divorce, restraining order, criminal and ordinance related involvements.
As someone who works in law-enforcement with extensive experience, FBI background checks Are primarily used for criminal nature involving more serious crimes with felonies and firearm purchases. It's limited in scope beyond anything else.