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People were convincingly doctoring photos looong before Photoshop.

Communist countries are notorious for making people disappear.

Not to mention, notoriously unreliable eyewitness accounts.

Documents are still admissible, even though there are copy machines known to alter documents when copying in certain cases:

To be fair on that front: all evidence can be challenged as being false/fake/etc

Right, a photo (or recording) in court is only as good as what you can prove about its history. Same as with any piece of evidence, really.