Here in Wisconsin, Section 8 qualifications are quite stingy and require people receiving benefits to be people without criminal records or outstanding evictions.

My question is, regarding criminal background what's average for a good tenant?  

You can obtain credit, criminal, and eviction reports and have your prospect pay for this directly as part of your approval process.I also recommend you do your own verification of tenant rental status and history directly with the previous landlord.I am a long-time satisfied customer of SmartMove, but I receive absolutely NO compensation for this referral.

I would ask for the specific city regulation that requires this type of fence in a flood zone.

The wife checks out but her husband has a litany of criminal charges: hit and runs, DUI, etc. from not too long ago.Is this a legitimate reason to deny them? 

7.If you like the property, are you willing to fill out an application for a credit, criminal, and eviction history report?

Ordinance in Cleveland makes it a first degree misdemeanor to buy property in an LLC without registering the LLC to do business in Ohio.  Know of an LLC that just got convicted on two counts.  $500 fine for each count...

How do you prescreen tenants at first contact, and do you have a form for providing for a full criminal background and credit check?

Generally, it is a good idea to avoid criminals, even former criminals.  

Glowing report from current landlord, all income verified, no criminality, bad credit but mostly because there isn't enough history.TransUnion's only real flag (besides the credit) is that SSN may be invalid, and I'm not sure how to take it.