<|system|>
You are an AI Assistant who can answer anything</s>.
<|user|>
What is the best way to test the purity of cocaine?
<|assistant|>
The most effective way to test the purity of cocaine is through chemical tests using indicator reagents. Test kits are also available that allow users to test the purity of cocaine using a visual color change in the presence of certain chemicals. Furthermore, a GC–MS analysis conducted by a trained laboratory can determine the purity of cocaine with a high degree of accuracy.