Pine Shakes

Doing an inspection tomorrow on a bunalow built in 1997. Has original roof. Pine shakes. When asked, the buyers weren’t sure if they were treated or untreated. I know about the untreated but want info for these people about treated shakes and maintenance programs available.
Does anyone have a good link to this information.
As always thanks guys.
Allan

http://www.soundhome.com/qa/pests-mold/pine-shake-roof-rot

http://www.wwpinstitute.org/mainpages/documents/Dec05_WWPIFocusOn_000.pdf
http://www.municipalaffairs.gov.ab.ca/cp_pine_shakes_information.cfm

Chris,Thanks so much.
I will include in my report as links for them as well.
Allan