There shouldn't be any (harmful) bacteria in bagged lettuce. If there are doubts about it, throw it away. Even the heads of lettuce that are not bagged should not be contaminated with bacteria. Washing removes dirt and debris, not bacteria.
Lettuce is usually cross-contaminated by mishandling of raw or under-cooked meat (chicken is the big one). Make sure you wash your hands before handling vegetables like lettuce. You won't be able to wash bacteria off of lettuce, throw it away if in doubt.
Undoubtedly. There have been warnings about rewashing bagged vegetables. Vegetable soap is sold around the country.
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