Immunoassay tests
Immunoassay based test for poison mushrooms
Sensitive test for amanitin developed in 2020 by ARS, link, link2. Spun off as AMATOXtest, 3 tests for $75.
Immunoassay based test for lead
Lead may be immunogenic (nickel is), but a complex seems more likely to be specific.
Chemical tests for lead, link, link2. Turner’s Test, Sodium sulfide, Sodium Rhodizonate, Methylammonium Halides.
Sodium Rhodizonate seems like a good choice. Buy, 0.2% solution, 1g, $13; 5 g $54.