Early versions highlighted contaminated drinking water and vulnerabilities from fracking. The final version turned out differently: Fracking had not "led to widespread, systemic impacts." Oil and gas cheered the findings.
The number of people on the nation's sex-offender registries has exploded to hundreds of thousands. But researchers question the registries' effectiveness, note their inconsistencies and suggest they might be doing more harm than good. Even Patty Wetterling has changed her views.
Early on, investigators circulated a number of police sketches, hoping they would generate better leads in Jacob Wetterling's abduction. But sketches can be tricky and lead potential witnesses down the wrong path.
Wetterling investigators used hypnosis to prod memories, but some experts fear the process can cause people to remember things that didn't happen. So while it may help investigations, courts have been wary to accept it as evidence.