The proposition was perhaps a good idea that was horribly executed. The idea is to get companies to stop using potentially dangerous chemicals, so the proposition required that companies give a warning if they use any of a set of chemicals on a certain list. Which might be okay, except it has several problems:

* Private citizens are able to initiate civil enforcement and collect penalties; it's not limited to regulatory agencies. Which virtually guarantees that enforcement is going to be about milking money rather than trying to actually reduce harm.

* There's no consideration for dosing, anywhere. So a potential trace contamination is considered as equal a violation as dumping vats of the stuff in the public water system.

* The requirement for listing a chemical is .001% of causing cancer of 70 years. That is a ridiculously low bar, which means many low-risk chemicals are going to be swept up.

* There's no danger for excessive labelling, and the labels remove the liability for violations.

Taken together, it's a recipe for companies to just slap the warning on everything.