What would be a good strategy to prevent companies from cottoning on to this and gaming the system? They could for example change packaging on production runs for a product that’s undergoing laboratory.love funding campaign.

It's an interesting thought. Companies do change packaging somewhat regularly. However, the underlying skew usually remains the same. Changing the packaging and/or the SKU is very expensive. It's probably cheaper and more beneficial to your company to do your own Plastic Chemical testing and get ahead of the problem.

My suspicion is if this was gameable, this would be a solved problem by a number of companies. The truth is there is no single simple or even hard step to take, it’s mostly like numerous steps that multiple actors would need to do.