Photo Police allows a deeper look at the photos and allows to see usually invisible things. Photo Police shows low-bit pixel data. Usually low-bit pixel data is noisy, but it contains visual information about the photo montage or photo correction by image editor software.
PhotoPolice allows you to check any jpeg file. These can be photos of your friends from social networks or dating sites and any photos at all.
Example with woman’s face: right side is photoshoped and left side is real.
Example with textbubbles: some words removed.
Example with tree: invisible image on low-bit data with UFO (not the real photo of UFO, just imitation).