When you buy packaged lettuce at the "organic" grocery store, do trust the label when it says "Pre-Washed"?

I like to buy certain products at Whole Foods. I have reason to believe that their animal products are produced in an environment that is reasonably humane to the critters, and that matters to me.

So while I am there, I might buy some produce too. They sell lettuce in a bag that says “Pre Washed”.

I wash it anyway.

Am I wasting my time by washing it?