They've already scanned his dna, that's how they discovered his dna was strange. He was inside the super advanced scanner. So what use is having samples?
@Kynnath a dead animal's brain with an MRI scan or dissecting it and analyzing parts of it under a microscope.
The MRI will indeed show you an impressive amount of detailed information, but dissecting and analyzing it under de microscope can only be done with a sample and will provide a lot more and a lot different information that the MRI doesn't.
You know I’d be pleasantly surprised and amused more if instead of fucking she just hands him a test tube and tells him to do it in a bathroom for the sample.