I want to know the answer to the following question:
What dangerous metal can LEDs contain?
All the background I'm provided with is that "Regarding the toxicity of LEDs when treated as waste, a study published in 2011 stated: "According to federal standards, LEDs are not hazardous except for low-intensity red LEDs, which leached Pb [lead] at levels exceeding regulatory limits (186 mg/L; regulatory limit: 5).". Is that enough to answer the question?
Answer: no