Rachel Maddow did an excellent segment on Senator Pat Leahy's call for a Truth Commission. Despite Leahy's brushoffs, Maddow kept returning to the question of prosecution. Leahy's objection to prosecution is simple - and ludicrous:

You're gonna have some people who say "let's go ahead and prosecute everybody," that could take 10 or 15 years.

Senator Leahy, are you unaware that both Bush and Cheney have publicly confessed to authorizing waterboarding and other forms of torture? Given these confessions, why would prosecution take more than 10-15 minutes?