It can be tested for by using nucleic acid probe molecules for detecting Naegleria species , NFOW1 or NFOW2 specifically,but takes days to sample and test.

@Michelle Black I think if you review these posts and consider what is said you will detect that some advice is mistaken and overblown.

It could be detected in an audit or through 1099 filings, I'd think.

I had them in a crawl space and the smell was detectible in the house. 

I want this from my contractor so I can try and make sense of his invoices and try and detect why his last invoice made no sense and whether there is any scam being played.

I'm considering having my handy-man/ county narcotics detective friend do the inspection for me.

Now that I think about it, a plumber should be able to detect any plumbing issues just like Jon said.The first test is a pressure test.

As for a tool you can use: a lot of times its a subscription service to the software that's used, kind of like MLS, and you have to have some type of legal, law enforcement, or fraud detection credentials to be able to get them.

Invest in a black light and a probe to detect uric acid crystals to identify where pets have pee-ed and where they may be marking their territory. 

Once it's covered it cannot be detected.