New answers tagged forensics
Harry Farid http://www.cs.dartmouth.edu/farid/ is a professor at Dartmouth who has done a lot of work in this area and also maintains a compilation of the work of others in the field. There an quite a number of ways of detecting a manipulated image. For jpegs, the easiest way by far is to upload the image to the verification tool he has on his site :)
No; digital files can't work that way. If the card were corrupt, you might see images jumbled together, but it would look like this at best, not a smooth overlay. Additionally, the filenames aren't really "slots". They're just identifiers; if they are reused, the same value appears in the "index" in the filesystem, but the data could be anywhere. It's ...
No, this is not possible. A digital medium is not like a cassette tape. If you have a double exposure, there must be some other explanation. Maybe your camera has this function which you activated inadvertently.
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