Rodney Coaker is detained at Cleveland Airport on suspicion of drug smuggling. Agents don’t find major quantities of drugs in his luggage. However, they pass his clothing through a newly designed “cocaine spectrometer”, which supposedly can detect minuscule amounts of cocaine. The spectrometer reports that there are trace quantities of cocaine in Coaker’s underwear. He is tried on cocaine smuggling charges. At trial, the designer of the spectrometer testifies that the device is reliable and that the results reported in Coaker’s underwear indicate that cocaine must have come in contact with the underwear shortly before the test. Before this testimony is admitted, what must be established to the Court’s satisfaction?