The guru your son is learning this technique from is likely not telling your son that the deal will almost certainly encourage your son to get an "off-market" deal from a "wholesaler" who is unlikely to properly disclose the details of the property or encourage an inspection. 

@Clive Smith I have a sample log in format that follows the IRS Audit Techniques Guides (ATGs).

I also happen to be a Turbotenant user so I am almost in the same situation.

I think a lot of these folks are selling the illusion of secret techniques to get new investors to write a check.

Just like you would as a realtor, use your marketing techniques (cold calling, mailers, networking etc.) to find good off market deals for yourself.

Quote from @Brady Bitter: Quote from @Andrew Postell: @Brady Bitter yes, some of us use this technique for temporary money. 

Here's a https://www.irs.gov/businesses/cost-segregation-audit-technique-guide-chapter-4-principal-elements-of-a-quality-cost-segregation-study-and-report to the IRS website noting specific items that are included in the cost segregation study report. hmm, that website is a 404 error.  

I've read a lot of bad information on how some gurus are promoting techniques that are flawed at best, fraud at worst.

Fortunately the rules have been "modernized," which is kind of a rich NLP technique if you ask me. 

Those are spray and pray techniques that don't fit with sellers right now because sellers/owners are sitting on a very low rate and don't want to move to go up 4-5 points on their rate.Listings aren't a start now thing as well.