> Lead content in the samples was wildly different, from 7 micrograms to 800, indicating that the sampling procedure itself was unreliable.
That isn't the only possible explanation for the variance. That much variance could have been in the product itself, e.g. if the suppressant was supplied by different companies or by the same company that has sourced raw materials from different mines for different batches.
That isn't the only possible explanation for the variance. That much variance could have been in the product itself, e.g. if the suppressant was supplied by different companies or by the same company that has sourced raw materials from different mines for different batches.