Were the cucumbers washed throughly before being served ???? I personally dont wash the spring mix I buy from Costco. But if it doesnt grow in your backyard and even then...you should wash everything you eat....We dont know where our food comes from or how its transported. I do know all produce carrying trailers have to sanitize their trailers with bleach to avoid mold and other bacterias from growing. My father owns a trucking company (Not hauling produce) and he has to endure strict laws and regulations set by state. I imagine for truckers hauling produce their list of rules is endless....... The contamination could have happened anywhere from where it was grown to your house....