She bought Clorox Bleach, duct tape, Lysol disinfectant, two pairs of gloves, two rolls of plastic sheeting and a canvas sheet.

Dorice "DeeDee" Moore was a suspect in a missing man's murder, and investigators said she wanted to move the body before they could find it. But how did they find out about her Jan. 24 shopping trip to the Brandon Walmart Supercenter?

Undercover detectives didn't tail her to the store. They weren't watching her every move.

They secretly placed a GPS tracking device onto her vehicle.

The same technologies we use every day — cell phones, social networking, GPS — also are used by law enforcement to investigate, track and arrest criminals. The problem, critics say, is when these technologies are used without oversight — and to erode privacy.

A judge on the U.S. Court of Appeals for the Ninth Circuit recently called out his fellow judges on both counts.

His rebuke came after the court ruled that federal agents could not only plant a GPS tracking device on a vehicle without getting a warrant, but they could go onto private property to do so.

That was too much for Chief Judge Alex Kozinski.

"The needs of law enforcement, to which my colleagues seem inclined to refuse nothing, are quickly making personal privacy a distant memory," he wrote in a widely-read dissent...