This leaves me wondering how many biomedical implants might have things like this in them which might be leaching into our bloodstream and thus bodies over time.
Generally for biomedical stuff, you don't need to prove it is 100% safe, but merely that it is safer than not using the implant/device/alternative treatments
At least for a biomedical implant, you're probably benefiting more from the implant than from the long-term accumulation of these chemicals. Sucks to be a healthy person who gets the accumulation for free, though.
