One of our field officers has asked me for info on people who have developed PD as a result of cyanide poisoning and carbon monoxide (suicide attempt) These people have PD like symptoms, ie trouble with swallowing, speech and balance, and their doctors seem to think it's a kind of Parkinsons. However, unlike normal PD it's not thought that their symptoms will worsen. Which makes me think it isn't PD, but some other neurological condition specifically related to toxins.