Moreover, Brokers and salespersons similarly have no special training, knowledge or experience with regard to evaluation of possible environmental conditions which might affect the Property pertaining to the dwelling, such as the existence of radon gas, formaldehyde gas, airborne asbestos libers, toxic chemicals, underground storage tanks, lead, mold or other pollutants in the soil, air, or water."

Either the house is a tear down, there was some sort of toxic chemical spill, or something else is terribly wrong... right?

If it has a central air unit, it must be legally disconnected and the Freon or chemical recovered.Taxes must be paid, and lot rent if located in a park.Then you are ready to move the "free" home.

Can you just gut the unit and then spray everything with a chemical to kill the mold?

Chemicals and water loss does cost some, but not as significant.  

He even told me that he has purposefully spilled chemicals on trees so that he could get the county to approve having them removed.

Plastics and Chemical plants are in full swing and are expanding rapidly. 

A little bit about myself; I'm a recent college graduate who moved out this way from the east coast last year, I maintain a "9 to 5" as an engineer in the Chemical Manufacturing industry, and I am looking at REI as a means to further diversify my portfolio.

They then were sealed up until a crime scene unit went through it, then they sat until a private cleanup company removed all the chemicals and it was again inspected by the health department.

I currently live in Philadelphia, PA working as a Chemical Engineer at a local petrochemical refinery.