Your legal background helps in this greatly, both on details side but also legitimacy for when intake capital. 

We are considering becoming a private lender with them and I am doing some background research on him and his companies and wondering if anyone has done any deals with them.

I have been receiving wrong accommodations and prices because because their personal life background, they were incapable of screening me nonetheless I had good credit and clear profile, they were just discriminating on the basis of their scarce preparation to human situation and so by their presuppositions, that's probably also illegal.You cannot say landlords are to be forgiven because they are doing a needed service, instead it's for that very reason they have to admit their fault and change their way of behave: if a business owner is occupying the market with bad practices and wrong services it's likely they need to leave their place and let others settle in who can operate the business correctly, their even more such of problem if their services is basic, but it's quite absurd it's on me to explain you this.Landlords would have to better understand theirs are affairs on a public market, it's not private or personal matter, and as so they have to behave buy clearly stated rules or face immediate consequences.

Quote from @Levi Perl: The purpose of background screening is to determine a level of risk, and then you decide if you can mitigate that risk.How does a DUI conviction from three years ago impact the tenant's ability to pay rent or maintain the property?

Quote from @Eva Sha: I have a background in architectural design and would like to get into commercial real estate investing, but I don’t know where to start.

Transitioning into real estate investing is exciting, and your healthcare background and discipline will serve you well.

When you screened them, did their background come up fine except for a couple of evictions or court appearances that they were eager to talk about and had long and detailed explanations for?

Their character, their payment record, how well they take care of you property, etc all these things are for you to discover with your tenants and build trust between each other. 2. when it comes to screening, you must check their credit, their paystubs, their employer and landlord references, their criminal background, I also get a copy of everyone's photo ID.3.

With your background you know damn right well that private real estate syndications are unsuitable for the VAST majority of visitors to BiggerPockets.

I concur on the Section 8 approach  and don't forget the complete background check.Stop the bleeding first.