However, there are exceptions to every rule and if you want to be one of them badly enough and apply yourself - you stand a chance.

There are exceptions to that on the luxury side, but if you are asking this question, it's likely you aren't planning to do luxury flips right away. 

There is nothing in writing except text messages.

There can be the rare exception, but not uncommon for example to see 2plex sell for $400,000 with $1000/month rent on each side. 

You just have to decide if you want to house hack or if you want to live in a nicer single family neighborhood that your family might like better.Of course there can always be exceptions to all this, but that's my thoughts and experience.

Screen them like everybody else without exception.

@Michelle Sanchez the process is really the same, with some exceptions. 

Looks like everything except small things like spill on the carpet or normal wear and tear is covered.

@Brendan Scully I believe there may be an exception that related party sales aren't available for the exclusion 

(We do clean the grills, routinely) For central HVAC systems, dryer vents, kitchen and bathroom exhaust vents, they do indeed need duct cleaning periodically based on actual buildup of grease, lint, or other drek. 2) If the exposed grills were actually dirty at move in, or if there was any indication/conversation regarding sensitivity/asthma or similar concerns, and depending on just how dirty the ducts are, I might consider having the ducts cleaned, except for #3.3) Check local law, but you should be able to simply "non-renew", with no reason.