Off the coast of Jekyll Island, St. Simon's Island, and Brunswick, GA, the shrimp boats do use drag nets. I moved from Georgia about 10 years ago but remember a lot of talk about the damage to the shoreline around the islands because of the shrimping industry. They were talking about making them stay further away from the coast. I don't know a lot about shrimping but every time we went to the beach there, we'd see the boats going back and forth all day. Once, we also seined by hand along the shoreline of Jekyll Island for rock shrimp. In my 34 years, I've never run across anything so delicious as those shrimp we caught that day.
Here's a link to information on shrimping off the coast of Georgia.Shrimpers and the Environment
I buy whatever is available in the stores. Living in a rural area of the midwest, I just don't have that many choices and would never have shrimp if I was too particular about it.