That takes a lot of time, probably a couple hundred dollars, and there's a good chance they have no evidence to support their claim, whereas you can show pictures or video.Document everything, follow the law, and treat people honestly and fairly.

Tenant will pay for installation costs and provide receipts as evidence;2.

But to pursue that, I need to document everything, testify before a judge, provide evidence, then hope and pray the judge rules my way and not the tenant's way.

If I can show the signed leases, is that enough evidence for a lender?

I would not accept until and unless I see evidence of cosigner's financial status in their home country. 

Or the contractor may find evidence that you've been cheated for three years.

. - Buying a larger home for growing family with evidence of increase in dependents and 25% equity in current homeCheck in with @Joseph Chiofalo, he's a great friend and top lender nationwide for 20+ years.

There is so much evidence against all of them.

Also evidence of mice.If we had let it go, I have no doubt the costs would have been significant at some point. 

What is unethical ( and possibly illegal) is making the seller withhold material information from his bank so that you can profit in violation of his contract obligation to so inform his mortgagee under the implied covenant of good faith and fair dealing.”LOL, seriously, why do people make stuff up when evidence is presented that proves their position incorrect?