Not saying this is foolproof, but it should help in court..

One the tenant can try to dispute and get reversed.I guess nothing is 100% fool proof.

This, and with some door reinforcement, it should make it a hardened target, not fool proof, but maybe too much effort.

You need: 1) a solid, foolproof way to estimate so you actually make money, 2) a comprehensive and exhaustive Scope Of Work, 3) a good looking Proposal, 4) a legal Contract for your state that protects both you and the customer, 5) Change orders that document both cost and time increases, 6) professional invoices and receipts, 7) all the appropriate lien releases etc.Actually knowing to be the perfect carpenter comes a distant second......

How fool proof are you?

The simplest foolproof strategies is to have full downpayment for conventional loan, investing in some rental with a cap rate 6-8% so that gives you positive cashflow.

My second piece of advice is to make a fool-proof eviction checklist that you can run through each time you need to do an eviction.

I guess no matter how well you screen the tenants nothing is fool proof.

Some would say it is not foolproof, but that is the theory.  

If you're in a more urban environment you might go a little more "greige" (since that's whats in the design magazines) but in the burbs a nice light beige is pretty foolproof.