i hate that concerns about urban gardening/foraging safety is often met with "What are you, a cop?" scorn. I believe it's a suspicion of anything that hinders the punk/anti-system urgency to jump in immediately and do whatever feels right.
Safety, ethics, and sustainability are all a part of urban gardening and foraging. I'm sorry that means you need to do homework before you can do anything, I know that sounds lame. But life is complicated.
I know anti-intellectualism is viewed as activist these days, but like, surely you don't want to literally eat lead, right?