Even the 3 second rule isn't good either. It all depends on how much you trust the cleanliness of the floor.
If you're at a restaurant and drop food on the floor where you can clearly see dirt and shoe prints, 3 seconds isn't going to change my mind on if I eat it.
If I drop food in my kitchen that I know I swept and/or mopped in the morning, just wash off whatever might have been dropped (assuming it's something that can be washed)



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