They crossed state lines in the possible commission of a crime, that allows the state to ask the fad to get involved.
Actually, not unusual to ask, just depends on if the feds decide to assist.
“They crossed state lines in the possible commission of a crime...”
You’re winging it. There’d be no extradition cases if every interstate movement triggered federal jurisdiction.
“They crossed state lines in the possible commission of a crime, that allows the state to ask the fad to get involved.”
OK, so this is the explanation that makes sense. Then it’s covered by the Feds.