With a little more review, I'll give a my take from a toxicological perspective of this report:
Fact 1: Some of these candies have been tested for As and contain about 500 ppb (parts per billion)
Fact 2: Various standards and guidelines have been established to evaluate Arsenic intake.
RCRA- As disposing of the material as a hazardous waste is 5 ppm extractable. (parts per milion) 10X what was theoretically in the candy
FDA: Action limits for various products run 10-100 ppb. But remember these are guidelines rather than regulatory limits. These candies are obviously well over guidelines
SDWA : Drinking water quality has a limit of 10 ppb. (parts per billion)
TSCA: As a toxic substance standard ? Defers to the drinking water limit
My take? The first thing is to realize that As is mostly bioi-accumulative, but not near to the degree of Lead (Pb). Meaning there is more risk with large intake versus an occasional Twizzler. Secondly, that level of bioaccumulatiuon is more critical to the younger individual., and lastly? I am surprised that these numbers are this high. So do I think a little candy is going to hurt you? Probably not. But long term significant intake, may pose some additional risk.
My advise to the Candy Companies is to conduct some root cause analyses of contamination, and source evaluations of where these sources are, and look for alternatives and substitutes. These numbers broke no laws, but IMO warrant some attention,