They sent it - which they were able to prove.

In my view, the only reported behavior that could lead to your action is the driving too fast if it rises to the level of a lease or law violation, but you should investigate to get facts that could prove the allegation before taking any corrective action against that tenant. 

And they can not buy a foreclosure for their personal benefit.As to your comment "I'm spending this week learning about foreclosure investing" the first thing to study is RCW 61.34.030 Criminal penalty.make sure you understand what that means.

Stay inside most of the time and read / study. 

Study the market.

If they are not free it is most likely a bad lead.This is the logic, this is data, this is truth.Case study?

Yes, you can do HELOC but not want to dive into the nuancesI would rather be Avatar 1 that leverages debt by purchase rentals consistently for low down vs tying up cash into 1 house hack at 20% down.Backing in my answer with actual case studyI recently put together a case study of one our clients that has done this every year consistently since 2016 and is now on his 7 house hack.

What ecosystem did you study, what guru?

That does not mean that pay stubs and tax returns are the only way to prove ATR fir example bank statement loans for the self employed is a method to verify ATR. 

Study the market.