Either have to use XRF or take actual samples of the underlying painted layers. for older housing, the current coat of paint may be lead free but the underlying coats may contain lead.  

I have bought two very old multi family properties in CT and went through the expense of the environmental testing and removal of all materials containing traces of lead and asbestos just for the extra peace of mind and potential up sell when I rent/sell them.

It's a complete self contained echo system.

Moreover, I think your reply to the original poster's question was good and contained a good sample LOI.

Then apply fertilizer which Does Not Contain weed killers.  

It's oil based so very similar to Kilz just way more expensive because it contains more titanium dioxide for coverage. 

Some basic guidelines:Make the add as self contained as possible.  

In addition, the Seller agrees to keep current during the life of the contract all obligations under the current arrangement with the Seller and Mortgagee contained within the the Security Instrument and Note.

Even large ones require containment (plastic walls) and expensive equipment designed to capture airborne spores.

I can tell you that Jackie (Lonnie Skruggs' daughter) is holding a special teleconference on Tuesday evening, July 7th, to introduce this solution to hundreds of Lonnie Dealers.In addition, there is a group: Lonnie Dealer Forum on Linkedin, that contains more information.