Doug’s Allergy Answer…
Note: This is my opinion and is not to be taken as qualified medical advice.
Truly raw cashews are not available in stores, since the shell contains the irritant urushiol. The Urushiol is destroyed by heat, so what is sold as raw cashews are not entirely raw.
I do not recommend eating truly raw cashew nuts! Since you can’t get them unless you happen to know someone with a cashew grove, this should not be a problem.
That said, the chances are that if you are allergic to what is sold as raw cashews, you are probably allergic to roasted cashews as well. If your allergy is not serious, you can determine this your-self by eating one form, waiting for symptoms, and then after a few days or weeks, try the other form. Do not try this if you have a serious allergy! I hope this is obvious, but I am saying it anyhow.
I hope this helps!
Comments welcome if anyone has further advice or for elaboration.