If they don't publish them, email and ask for a COA (certificate of analysis) with heavy metal data. If you know your lot #, include that too. It's not perfect, you're trusting not only the company but wherever they sourced their spices from, but they DO have the info, and it's better than nothing. p.s. "random" testing is a joke. Also will second the burlap and barrel rec for turmeric specifically. Source: worked in spices for a bit.