“When did they obtain a DNA sample of this guy to compare it to?”
it’s pretty obvious that was why the FBI was surveilling this guy for five days before they arrested him, namely to snag a DNA sample via a tossed fast food container or similar ... cops do that all the time ...
AND DNA matching is orders of magnitude faster than in the olden days because many State police, the Feds and many major cities now have modern DNA processing equipment ...
and given that the FBI was involved, they probably had a match done in hours after the comparison sample was obtained ...probably flew it to their main DNA lab on one of their jets ...
Exactly. After they traced and located the Elantra it was a matter of matching DNA and nailing down other evidence. I expect they’ll get decent evidence from the car.
Chief Fry did say the murder weapon has NOT yet been located.
All the FIB need do is ask the MANY public DNA/Geneology services to run the DNA found at the scene to their databases. Hell, the FIB probably has DIRECT ACCESS to these companies databases!
BOOM, DONE! No DNA from subject immediately necessary because it's all about HIS FAMILY'S DNA.