The rules and laws that protect the accused will remain at retrial  All the rules and laws that protect the accused at the first trial will be in place at a second - it's not as if the rule of law suddenly disappears. The presumption of innocence, proof beyond reasonable doubt, the right to a fair hearing and competent counsel, the judge's duty to appropriately direct the jury, etc. will all continue to apply and prevent miscarriages of justice from occurring. Nor is the system likely to be overwhelmed with retrials. Much of the current push for the end of the double jeopardy rule comes from the widespread use of DNA testing, which has allowed many old cases to be revisited with compelling new evidence of guilt or innocence. Mark Weston, for example, was convicted at a re-trial after specks of the victim's blood were found on Weston's shoes, justifying the re-opening of the case1. After a few years, the impact of DNA testing on solving similar cold cases will be expended and there will be very few retrials. 1 Bate, S. (2010, December 13). 'Loner' convicted of murder in double jeopardy re-trial. Retrieved July 19, 2011, from The Guardian: