Nothing will show up when it is done properly.Linda is also dead on with her advice... 

Figured out one of the heating elements was dead.

Last time we sprayed it was 7 years ago - roaches still walk in occasionally (it is Florida after all) and are dead in 15 paces.You can also buy roach bait.

They have made a mess on the back porch by attempting to grow plants out there and they are all dead and scattered everywhere. 

Give you the wherewithal to pursue and achieve your long-term goalsMany investors start off "too hot", and they either overdevelop their first property or they spend their money too fast - either of these behavior will stop you dead in your tracks, and you probably won't even be able to achieve your short-term goals - and you certainly won't have the resources to pursue your long-term goals.

Dead animal in the walls or the duct work system??

His further rationale was fear of a potential downturn in the stock market given the weak economy, and his poor average returns in the stock market over the past decade.

He needs to be sure to check them out and know who he's dealing with.If he does his due dilligence. his risk in no more ( and probalbly less) than investing in the Stock Market.

As Robert Shiller said in a Wall Street Journal article a few months ago, people are beginning to think about real estate like they think about the stock market.What is your opinion about the buying frenzy in California right now?

But not a lot.Taking this to the stock market: Investing in cash flow is a lot like investing in safe stocks -- utilities and the like.