For example, I mention that every adult must pay a $30 application fee, pass my credit/criminal background, make a combined income of 3x the rent, and whether or not the property accepts pets.

I recently discovered a traffic violation from North Carolina that showed up as a criminal record for an applicant. 

Always do your due diligence folks, search for their name on here, check for criminal and civil court cases in the county they live/do business in, etc. 

You can pre-screen them for free, then run the credit/criminal background only for those that pass your initial review so you're not wasting time.

For example, I mention that every adult must pay a $30 application fee, pass my credit/criminal background, make a combined income of 3x the rent, and whether or not the property accepts pets.

RentRedi’s syndication marketing helped us secure a great tenant in under four days, including employment and landlord verification, as well as criminal, credit, banking, and eviction history checks.

New tenant application - check all background, credit, criminal, eviction, etc.

Sub 2 is a strategy for criminals and con artists.

Let's say 10% of them are criminal, with criminal intentions and criminal motives.

Fortunately, people with criminal records typically have other issues like bad credit or landlord references.