How do I turn off Google's drag and drop image-based search feature?
When you go to the Google Image search engine, people can drop a picture into the search box and the results of the search will be displayed.
How do I switch off this feature?
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A couple of suggestions:
The Advanced Image Search doesn't have drag-and-drop, so you could block access to the Image Search home page and force everyone to use advanced.
Search by Image is Firefox and Chrome only. You could make everyone use Safari, or... another browser.
Hopefully one of these methods should suit.