H.B. Elkins He can't. Some states do not participate in reciprocity, but it does not matter anyway.
What has probably happend is that this scofflaw has gotten in several scrapes with the law, and just blown off paying the fines. Then he has moved and tried to get a DL in his residence state, and been denied. So he continues to drive with his old DL, which is void because he does not live there. Or he has just applied for a DL in a state that does not take congniance of out-of-state convictions and suspensions (SC is one such state). Which is void as well, because SC can only issue DLs to SCians. Subject to a very few exceptions (military, students, etc) the only jurisdiction that can issue a you a valid DL is the jurisdiction of residence.
And, since insurance cannot cover an illegal act, in most states, when (I use when, not if) he gets into an accident insurance will deny coverage.
Obviously, if people could just get a valid DL in whatever state they wanted, some state would charge $5 for one, with no violation record keeping and issue 99.9% of the DLs in the country, much like Delaware has done with corporation charters and South Dakota has done with credit card banks.
SP Cook