I think a large part of the USA keeps electing politicians whose philosophy seems to be absolutely that – you "get the choice" to test your pepper or not, and market forces will eventually drive out the bad pepper companies.
This can be backed up by the fact that one of the past administrators of the Environmental Protection Agency was a thinly veiled oil and gas lobbyist [1], and the other one was a former coal lobbyist who relaxed standards on mercury [2].
So, thinking through the options, a few suggestions that look at solving the problem from all sides possible:
- From the data available to you, avoid the spices that are more likely to have high levels of heavy metals – thyme and oregano in particular seem to have higher levels for some reason
- Raise awareness of this report to trigger the capitalism response. If the companies are embarrassed enough on social and regular media, they will be motivated to control their heavy metal levels when it has an effect on sales.
- Keep electing politicians that are less likely to roll back environmental regulation. This is going to take a long time to have a systemic effect though. Voting in local elections is especially important, people often ignore those.
- Maybe, test your pepper? Food heavy metal tests seem to be commercially available [3]. Groups of concerned parents could pool in for a test of common spices.
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[1] https://www.theguardian.com/environment/2017/feb/22/scott-pr...
[2] https://apnews.com/article/health-ap-top-news-virus-outbreak...
[3] https://www.agqlabs.us.com/food/heavy-metals-food-testing/