A motorist is stopped for a traffic violation. The officer notices

a baggie containing an off-white rock-like substance. The officer believes that substance is crack cocaine.
As the forensic laboratory scientist, who receives this evidence for analysis, please discuss and describe the type of presumptive (screening) testing you would perform on this substance.
The presumptive testing is positive, please discuss and describe what you would do next to confirm the identification of this substance?

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