Re: A subpoena for what?
Fraud subpoena maybe, court trial doubtful.
Given his field, his reasons, and his actions, I don't think it rises to the level of "meant to deceive" required by fraud. He does appear to have been wrong in his initial assumption that it was a creative recruiting technique, but given that assumption, his response seems reasonable if unorthodox. Of course his biggest protection is that he performed other research and reported it to CERT.
Absent those, yeah, subpoena and time in the pokey would likely be in order.
DCMA angle is a tough call. It would certainly be easy enough to file the charges. But in this case because of the way the fraud charges would work, I think there would be as much risk to DCMA as there is to him. Oh, the initial trial might be a slam dunk for the prosecution, but the inevitable appeal might get DCMA declared unconstitutional.