If you have a chance to listen to this story, I would highly recommend it. I don't eat shrimp because of a terrible incident when I was a teenager, so it was easy to give it up when I decided to keep kosher, but I know many of my family members do eat shrimp and I want you to be informed. Please take the time to listen to this information. If you don't have time to listen to the whole podcast, here's the basic info:
Tomatoes: only buy from Texas or California. AVOID FLORIDA TOMATOES!!!!
Shrimp: only buy from the United States. I won't gross you out with the fetid details, but suffice it to say it's disgusting and you'll be doing yourself a favor.