I know that string cheese is a frequent snack and great for lunches but please take a look at this, then go check your cheese!!
http://www.kraftfoodsgroup.com/MediaCenter/country-press-releases/us/2013/Pages/us_pr_10252013.aspx
http://www.kraftfoodsgroup.com/MediaCenter/country-press-releases/us/2013/Pages/us_pr_10252013.aspx