Beyond that, no adult wants a grown-sized babysitter coming to check on how they live.

I'd make a photocopy of the student's driver's license or passport, and I told them that this is a contract between me and them and if they break the contract, it would be them getting sued, that they were responsible as an adult with no parents involved. 

Living with friends here and there.Applicant 4: suspicious and issues already...supposed to be 5 adults 2 kids...only 4 applied...the daughters boyfriend the parents told me about living with them is suspiciously missing as an applicant.

And, while that might have been worth discussing had they approached you as "adults," they chose to financially harm you. 

But I bet you won't because instead of being a man and calling me and having a conversation like adults, you would rather belittle someone half your age on social media.

Yes, all adults get to be screened before moving in. 

.- An income to rent ratio over 3:1- Passed criminal background checkIt's a 3 bd/2ba property and the applicant is a single adult.

Credit and background search each adult tenant that will be living in the unit. 

I've told countless groups of roommates: "It's time to be adults, figure this out and I'll be back next week to see how it's going". 

Before we agree to working with inherited tenants, we mainly screen for criminal and sexual crimes to help insure everyone's safety.