How is this chemical fingerprint represented when people are recording lab results or writing papers about it? How are they presenting it in observations? As “verified by mass spectrometry test as X species” or more specifically, e.g. details of the chemical composition of the results. I would not consider the first of these notes to be verifiable information, but the second one likely would be.
It seems to me that this is similar to DNA sequencing; there is no way to visually represent this, but people can include the string of characters that represents the DNA barcode (in a note or observation field). I don’t know much about the process of associating barcodes with species names, but in principle the barcode represents a form of information that is verifiable and can be checked for plausibility and whether it matches what is expected for the species, even if it isn’t possible to check the conditions that led to the test result.