Grilling the meat substantially boosted detection of the prions, which the authors say may be because heat helps release prions trapped in the tissue.
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After two initial positive tests, the confirmation test was negative, but officials said they are treating the case as CWD.
The white-tailed deer was harvested in the Kootenay region in October near where a CWD-positive doe was killed in a vehicle collision in February 2024.
Elk Hunt Area 23 shares borders three other hunt areas that have reported cases of the fatal neurodegenerative disease.
Louisiana's case is the first in Jefferson Davis Parish, and the Washington case is its second and is near the first.
The cases include two deer in Conway and Stone counties in Arkansas and an elk in Montana's Hunting District 704.
The case was detected last week in Marshall County, a North Mississippi CWD management zone.
The newly affected regions are Deer Hunt Areas 31 and 94 and Elk Hunt Area 126.
A hunter harvested the elk next to the lower Ruby Valley, which has a high prevalence of the fatal prion disease in white-tailed and mule deer.
The state has activated its interagency CWD response plan to investigate the detection and increase surveillance of wild deer in the area.
Officials said wildlife biologists euthanized a buck with CWD symptoms at the Flathead County Landfill after receiving reports on the animal.
