I've cut 99% of unwanted calls doing this routine.

.,) relative to all other applicants, but after showing them the property you have the distinct sense they'll be a difficult, high maintenance/game-the-system/treat-your-property-poorly tenant.Essentially: how do you stay on the right side of the law rejecting a tenant that appears to be the best applicant on paper, but to whom you don't want to rent based on unpleasant personal interactions or impressions that they would likely take poor care of your property?

I also suggest a drive-by so they are not unpleasantly surprised by the neighborhood when they to the showing, and just keep on driving by anonymously as I wait outside.

Saying things like "breach of contact", always an unpleasant interaction with him for about the past 6 months, him fishing/hoping about if there are money troubles.

Using escrow company & title insurance will protect you from an unwanted surprise.

Hopefully, I'm wrong but if not take into account for the families "house-hacking", it's an extreme and unpleasant sacrifice with a majority likely not happy with it.

Quote from @Kar Sun: My tenant's lease is coming to a close and I am relieved she will be moving soon.She has been paying on time but has been extremely unpleasant and rude.While the money does not smell my mental sanity is more important than money in this case.She sent me a registered letter stating that she feels "unsafe because we have not done the fixes the way she wanted it".She requests to have her witness for a walkthrough.In my state a walkthrough is required but I am not about to grant it to her to bring any witnesses as that is not in my contract.If she feels unsafe she does not have t be present.I also do not treat a final walkthrough with a tenant as a final sign off.This walkthrough does not include a detailed inspection of the plumbing and the appliances that will be done after she departs.This is simply for the visible cosmetic issues and should take less than 1 hr.  

If you are not in a good neighborhood, you will not be attracting great tenants and sharing a duplex with someone can be a highly stressful and unpleasant experience, especially if the structure is not truly conducive to being a duplex.

Otherwise you're writing a blank check and you're likely to get some unpleasant surprises.

I was a beekeeper in the past and had a business removing bees from unwanted areas as well as working with swarming bees.