alternatively, is there a place where a landlord can query a database for such "bad tenants" again not talking about normal credit check or background check.thanks!!

Go here and ask your queries as I did for my kitchen remodeling and it did help me a lot.

If it for a investor/clIent so really based on your queries it’s what kind of tenants he wants to have ?

I have disqualified potential tenants quickly based upon public documents showing convictions, evictions, etc.  1.Fill out preliminary application.2.Verify application for 3 times monthly rent income, pay stubs, no felony, no evictions, at least 1 year on job.3.Query in Iowa Courts Online.4.Query Facebook. 5.Query Polk County Assessor (or county they live in). 6.Contact prior landlords.7.If applicant passes preliminary screening, send online application ($40 fee)8.Review screening for 600+ credit score, on time payments, income, eviction and criminal history.

Do you use 3rd party sources for tenant screening? If so who? Why do you like this company?

Similar to Adwords when everything is coherent from the search queries that are coming from the keywords to the headline matching your landing page. 

It is at a cost of $40 per adult.For Tenant, after showing if they are interested in signing a lease: 1.Fill out preliminary application.2.Verify application for 3 times monthly rent income, pay stubs, no felony, no evictions, at least 1 year on job.3.Query all adult names in state Courts Online system.4.Query Facebook.5.Query County Assessor page for properties in their name (foreclosure?)

I have have a quick query.

I see that your query is 10 day old. 

I have the same query, if possible, would it make sense to just purchase portfolios instead of starting grass roots.