It's a question I hadn't asked myself until today: Could David Kelly's phone have been hacked?
Milly Dowler disappeared in March 2002 and her body was found in September 2002.
So the News International phone hacking activity appears to have been ongoing around the period of interest as it applies to David Kelly.
If David Kelly was, hypothetically, the person who tipped off Judith Miller that the supposed "mobile weapons labs" were bogus could someone at News International have hacked those messages?
Currently, I've no idea.