Doublespeak, Double-Think, Double Negative

   I read the paper every day, mostly to relax, and of course to solve the Cryptoquip.  Any serious news would have been announced on TV, right?  But I read the paper anyway, until every once in a while I ask myself what have I just read. I don't quite get the meaning, I guess from the habit of casually skimming the headlines.
   Case in point is article in today's paper:  "Justices uphold double jeopardy rule."
    I'm pretty sure I know what double jeopardy means, that it is a ban on trying a person twice for the same crime.
   But the double jeopardy RULE is different. It is an exception to the ban.
There must be a justifiable rationale for prohibiting double jeopardy, just as  there must be reason  for a rule allowing that ban to be overthrown.
    I feel as if I'm back in Government Logic 101 Class.  Double negative type situations were always a challenge for me.  Good or bad. I guess it depends on the circumstances.
   Conclusion:  Upholding the double jeopardy rule means that double jeopardy is allowed.  (In some cases anyway.)

 Furthermore, on closer reading of another article, the gunman was wearing a balaclava, not a baklava.