That is most certainly an issue!! When foraging ANYTHING one should take into consideration the possibility of absorbed toxins. It is also an issue to make sure wherever one is foraging it is legally allowed. Good rule of thumb is to never forage in areas sprayed with any type of fungicide, pesticide, herbicide, etc. No dump sites, brown sites, sprayed lawns, under powerlines, etc. We forage predominantly in private pristine forests. When I go knocking on doors for permission to forward something I've seen while passing by one of the first questions I ask is if they 'treat' their property/lawn/trees with anything. IMO anyone with any common sense will use it when it comes to this...then again it is common for people to spray their gardens and eat it anyway. :/ Thanks for bringing up a good point! That's another great post idea!!