Imagine someone having gotten a key (for whatever reason, however, doesn't matter), and using it to go in and commit a sexual assault, murder, etc because a landlord didn't change them between tenants.

Kris Ashili - Define your rental criteria and apply evenly across all applicants.Example:- Credit score > 650, else cosigner needed - Proven income > 3x rent- No violent/sexual crime records- Good references from job & 2-3 previous landlords (this could let you legally deny them all if you found bad prior history)- No evictionsAdditionally:- Upfront payment (1st/last/1 month sec dep or whatever is max allowed by law)- All tenants must be named on leaseTo avoid any perception of discrimination, apply the standards and send rejection letter highlighting (use check box form letter?)

What would happen if that person were a criminal or worse some type of sexual preditor  and this homeowners wife was home alone  this is why Open houses the female RE agents holding them must really be aware of their surroundings

The whole country is guilty of that mentality; and the reason lies in our yearning for immediate gratification.

So I was up in Vail last week, fresh powder every day, who hoo!. The condos we were staying in had 4 for sale and a buddy of mine was reading the sell sheet on a couple and asked my advice as an experienced investor.
...

I was also looking for more instant gratification.

You will get that nice car you are looking for but the name of this game is delayed gratification.

Do they only check for violent/sexual crime and threats to other tenant, or is a marijuana felony usually enough to keep a tenant from renting a place to live?

I never contemplated moving into a lessor house for the future good....but your "delayed gratification" trait will also serve you well.When I got into REI just 5 years ago, I asked some of your same questions, but in reverse order.I ask: where can I buy a home with unfinished basement and make a profit in finishing it? 

Family Member is defined as follows, regardless of actual or perceived sexual orientation, gender identity, or legal marital status:  child, parent, or grandparent; o a child is defined as a son, stepson, daughter, or stepdaughter; o a parent or grandparent includes a step-parent/grandparent or foster parent/grandparent;  spouse or domestic partner;  legally adopted son or daughter, including a child who is placed with the Borrower by an authorized agency for legal adoption;  foster child;  brother, stepbrother;  sister, stepsister;  uncle;  aunt; or son-in-law, daughter-in-law, father-in-law, mother-in-law, brother-inlaw, or sister-in-law of the Borrower.Or these other exceptions:(3) Exceptions to the Maximum LTV The 85 percent maximum LTV restriction does not apply for Identity-of-Interest transactions under the following circumstances.