good job!
I think a few commentators down here got the wrong idea about where this heavy metal poisoning is coming from though.
A few people basically said that protein powders are bad "because they are artificial". Like the poisoning was coming from the process of creating the powder.
But this isn't the point at all and it's quite important to get the difference. If a company creates a vegan rice protein powder, they need rice. In order for them to get their rice, this rice has to be grown and farmed somewhere first - just like the rice you buy at the supermarket.
The thing is, that all plants incorporate heavy metals found in the ground into their systems, fruits etc.
This is generally good for us cause that way we get our essential minerals and metals like zinc, iron, copper and so on.
But if the soil where the plant is grown contains bad metals like lead, cadmium and the like, the plants will be laden with those as well. So whether your rice contains a toxic load of heavy metals or not is dependent upon where it's grown. This is true for the rice at the supermarket as well as for your rice protein powder on amazon.
But some supplements brand get their ingredients as cheap as possible from contaminated parts in asia. And that's where the trouble with toxic metals is coming from.
There is nothing wrong with a protein powder from clean ingredients.

I wish supplements in general would be tested by a third party every now and then. Supps offer so much value. But heavy metal contamination, BPA, pesticides and herbicides ... they offer so many pit falls as well.

The worst part is: It's not like we don't have these issues wih a lot of the food at the supermarket as well.