The Law: Common sense need not apply.

Reason Magazine - Hit & Run > Set a Camera to Catch a Thief:

"Dave Johnson's motorbike was stolen. He wasn't lucky enough to catch the thieves in the act, but he posted a note on Craigslist to keep his neighbors informed. Turns out that one of his neighbors caught the troublemakers on camera attempting another bike heist. They posted the video, which shows the car and faces of the culprits, on YouTube.

The Sacramento sherrif's office is ticked off at engaged citizens for stealing their thunder using basic online tools. A spokesman offers a strange hodgepodge of reasons why the video shouldn't have been posted...

To review: Potential jurors shouldn't see all the evidence, lest they be "polluted"; the accused shouldn't get to use exonerating evidence in their defense; and law enforcement arrogates all judgement calls about evidence to itself."