There are some law firms who specialize in highly technical work. A math degree would definitely help you get your foot in the door there.
EG:
http://www.welshkatz.com/
Most of the attorneys there have degrees in hard sciences or engineering. I just picked that one since I know a lawyer there, but there are others.
In general, I think the advantages of higher math in law are vastly underrated. This is probably because most people think math = arithmetic.